A 10n force is applied to a 25kg mass to slide it across a frictional surface. What is the acceleration of the mass?

The force of gravity on the skydiver is

F(g) = (mass) x (gravity)

F(g) = (70 kg) x (9.8 m/s²)

F(g) = 686 Newtons, downward  (her "weight")

If, through some mysterious process, the force due to air resistance acting on her is 1,200 Newtons upward, then the net force on the skydiver is

F(net) = (686 N down) + (1,200 N up)

F(net) = 514 Newtons, up

The skydiver is accelerating UP, at 7.34 m/s² .

I have no idea how this could actually happen in the real world, but the Math and Physics are bullet-proof here.

Final answer:

The acceleration of the skydiver is approximately 17.14 m/s².

Explanation:

The acceleration of the skydiver can be found using Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration.

Given that the force due to air resistance is 1200 N and the mass of the skydiver is 70.0 kg, we can set up the equation:

Net force = Force due to air resistance

70.0 kg * acceleration = 1200 N

Solving for acceleration:

acceleration = 1200 N / 70.0 kg

acceleration ≈ 17.14 m/s²

Therefore, the acceleration of the skydiver is approximately 17.14 m/s².

Hypothesis

Let there is no air drag or any other resistance force due to surrounding

Now the force equation of ball is given as

[tex]F = mg[/tex]

[tex]ma = mg[/tex]

[tex]a = g[/tex]

so the ball will be dropped down by acceleration a = g and this acceleration is independent of size and mass of the ball

So in this case both balls will be dropped by same acceleration.

So here both balls will hit the ground at same time

Final answer:

The hypothesis is that the basketball will reach the ground first due to its lower air resistance compared to the larger exercise ball.

Explanation:

Hypothesis: The basketball will reach the ground first.

Reasoning: When objects fall, they accelerate at the same rate due to gravity, regardless of their mass. The air resistance acting on the larger exercise ball will be greater due to its larger size, causing it to fall slightly slower than the smaller basketball.

Example: Consider dropping a feather (light but has air resistance) and a coin (heavier but less air resistance) simultaneously from the same height, and you'll notice the feather takes longer to reach the ground.

Putting effort at point IV of this lever gives no mechanical advantage because it requires a greater force.  So the correct answer is C).

Answer:

c

Explanation:

I believe that air, bicycles, people, clothes and trees are matter however sound waves and sunlight are not. :)

Answer:

air, bicycles, people, clothes, trees

Explanation:

A pendulum swings performing back and forth motion and having a kinetic energy of 400 J then both the kinetic and potential energy are decreasing. Hence, option A is correct.

The energy that an object has as a function of motion is known as kinetic energy. It is described as the effort required to move a surplus body from rest to the indicated velocity. The body will hold onto the kinetic energy it acquired during its acceleration until its speed changes.

The body exerts the same amount of effort when slowing from its current pace to a condition at rest. Formally, angular momentum is any term in the Lagrangian of a system having a time derivative. Mathematically, it is represented as [tex]\frac{1}{2} mv^2[/tex].

Therefore, both the kinetic and potential energy is decreasing, so option A is correct.

To know more about Kinetic energy :

https://brainly.com/question/26472013

#SPJ2

Final answer:

The statement that is not true is 'both the kinetic and potential energy are decreasing,' as this violates the conservation of energy in a swinging pendulum. Energy is transferred from potential to kinetic and vice versa, not decreased simultaneously.

Explanation:

The question relates to the conservation of energy in a swinging pendulum, a common topic in high school physics. Specifically, it concerns the relationship between kinetic energy and potential energy during the pendulum's motion.

When a pendulum swings back and forth, its kinetic energy and potential energy are constantly interchanged. At the highest points of the swing, where the pendulum momentarily stops before changing direction, the kinetic energy is zero and all energy is stored as potential energy. On the other hand, at the lowest point in its path, where the pendulum moves fastest, the potential energy is at its minimum and kinetic energy is at its maximum.

Given this information, let us examine the provided statements:

A- This statement is incorrect because, at a particular point, both energies cannot be decreasing at the same time since energy is being transferred from one form to the other.

B- This is true, as the kinetic energy is zero when the pendulum reaches its highest point.

C- When the pendulum's kinetic energy is zero at its highest point, the potential energy equals the total mechanical energy, which would be 400 J if no energy were lost to friction or air resistance.

D- This statement is correct as it follows the principle of energy conversion, where an increase in potential energy is matched by a corresponding decrease in kinetic energy and vice versa.

Therefore, the statement that is not true is A - both the kinetic and potential energy are decreasing. The potential energy increases when the pendulum reaches the highest points of its swing (where the kinetic energy decreases to zero), and the kinetic energy increases as the pendulum swings downward and potential energy decreases.

Answer

The net force applied will increase

Explanation

According to Newton’s second law , force is the product of mass and acceleration. In this case, when a friend joins in the pushing of the door, the total net force applied on the door increases and the door will open with much ease. Force=mass × acceleration,

                      F=m × a

Answer:

The force will change as the net force applied will increase.

Explanation:

If you are pushing on a door really hard, trying to make it slide open and if your friend is also stand behind you and contributes to help you push towards the door, then the overall force will change as the net amount of force applied will increase.

This is an example of Newton's second law according to which you need more force to move an object with heavier mass.

F = ma

Therefore, the force applied by you and your friend will add and the net force applied will be increased.

I would recommend, to include the scientific part of Newton's Laws of motion, with an example. Also, state how all three laws play a part in the activity. It seems like you just did the realistic part of it, swimming, now include how it happens with correct vocabulary.  Good Luck!

The Benefit of Fossil Fuel Consumption among the Given Options is :

B. Cheap Energy

Because :

✿  Fossil Fuels are Non - Renewable.

✿  They result in High Pollution and Greenhouse Gases.

A benefit of fossil fuel consumption is B. Cheap energy.

Fossil fuels, such as coal and natural gas, are widely available and can generate electricity at a relatively low cost. Despite their environmental drawbacks, including high carbon emissions and pollution, the existing infrastructure and technological development around fossil fuels make them an inexpensive energy source.

Answer:

Given that

mass of ball ( m) = 2 Kg,

velocity (v) = 2.8 m/s ,

Momentum of ball = ?

   We know that "Momentum is simply means, mass in motion

                 Mathematically,                        

                                  momentum (p) = m.v

                                                           = 2× 2.8

                                                           = 5.6 Kg.m/s

                                                =

The forces on the  y axis are:

N-mgcos(60)=0   , wich becomes

N=mgcos(60)

Rember that the friction force is always contrary to the motion of an object and its formula is  f=μ * N

The forces in the x axis are:

-f + mgsin(60)= m * a

-μ*mgcos(60) + mgsin(60)=m*a  ,

μ = ( m*a - mgf=μ[sin(60) )/ ( mgcos(90) )

Dave's ball, with a mass of 0.07 kg thrown at 28 m/s, reaches a maximum height of approximately 40 meters. This is calculated using the conservation of energy principle, equating the initial kinetic energy to the potential energy at the ball's highest point.

To determine how high the ball goes when Dave throws it straight up into the air, we can use the principles of physics and the conservation of energy. Given that the ball has a mass of 0.07 kg and is thrown at a speed of 28 m/s, we ignore the air resistance as per the question's instruction. The maximum height (h) reached by the ball can be calculated using the equation derived from conservation of mechanical energy: the kinetic energy at the point of release equals the potential energy at the highest point.

The kinetic energy (KE) when the ball is thrown is KE = (1/2)mv^2, where m is the mass and v is the initial velocity. The potential energy (PE) at the highest point is PE = mgh, where g is the acceleration due to gravity (approximately 9.81 m/s^2) and h is the height. When the ball reaches its highest point, its velocity is 0 m/s, so its kinetic energy is also 0, and all the initial kinetic energy has been transferred to potential energy. Therefore, (1/2)mv^2 = mgh.

Solving for h gives us h = (1/2) * (v^2 / g). Plugging in the values, we get h = (1/2) * (28^2 / 9.81) which equals to approximately 40 meters. So, the ball thrown by Dave reaches a height of roughly 40 meters.

In this question we have given

length of runway=400m

speed of jet=641m/s

we have to find time to cover 400m distance

we know that

[tex]time=distance/Velocity\\therefore\\Time=400/641\\=.624S[/tex]

if jet fighter is landing on an aircraft carrier at speed of 641m/s then it will have .624S to slow down to a stop before it falls off the runway

The time taken by the aircraft to come to rest on the runway is [tex]\boxed{1.25\text{ s}}[/tex].

Explanation:

Given:

The initial speed of the aircraft on the runway is [tex]641\text{ m/s}[/tex].

The final speed of the aircraft on runway is [tex]0\text{ m/s}[/tex].

The distance covered by the aircraft on runway is [tex]400\text{ m}[/tex].

Concept:

The aircraft moves on the runway and comes to rest under the constant acceleration during its motion. In this case, the acceleration acts in the opposite direction of the motion of aircraft.

The average velocity of a body that has constant acceleration during the motion is defined as the mean of the initial and the final velocity of the body.

Write the expression for the average velocity of the aircraft.

[tex]\boxed{v_{avg}=\dfrac{v_{f}+v_{i}}{2}}[/tex]

Substitute the values of initial and final velocity of the aircraft in above expression.

[tex]\begin{aligned}v_{avg}&=\dfrac{0+641}{2}\\&=320.5\text{ m/s}\end{aligned}[/tex]

The time taken by the aircraft to come to rest can be calculated as the ratio of the distance covered to the average speed of the aircraft.

Write the expression for the time taken by aircraft.

[tex]\boxed{T=\dfrac{v_{avg}}{d}}[/tex]

Substitute the values of distance and the average velocity of the aircraft.

[tex]\begin{aligned}T&=\dfrac{400\text{ m}}{320.5\text{ m/s}}\\&=1.248\text{ s}\end{aligned}[/tex]

Thus, the time taken by the aircraft to come to rest on the runway is [tex]\boxed{1.25\text{ s}}[/tex].

Learn More:

1. The average speed of the car in the entire trip is https://brainly.com/question/504792

2. The effect of change in radius on the angular velocity https://brainly.com/question/5813257

3. The distance at which the tennis ball falls after being hit https://brainly.com/question/2843859

Answer Details:

Grade: High School

Subject: Physics

Chapter: Motion in one dimension

Keywords:

Aircraft carrier, runway, fighter jet, initial speed, landing, comes to rest, acceleration, average velocity, constant, distance, time.

Answer:

The truck will hit the car at rest, causing the car at rest to have an initial velocity of the velocity of the truck right before it hits it, then after the truck hits the car, there will be an equal and opposite force, so that is what causes the cars to accordion, because the force that the truck exerts on the car at rest will also be exerted on the truck.

Explanation:

Since Newton's first law says an object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an external force, we know that the external force is the truck and that will cause the car at rest to move.

When a moving truck collided with the car, according to Newton's first law, the inertia of both of the car and truck is be changed and According to Newton's second law, the smaller mass in between the truck and the car experiences greater change in velocity.

According to Newton's First Law, a body in uniform motion or at rest will remain in that state up to and unless a net external force acts on it.

According to Newton's second law, an object's acceleration caused by a net force is directly proportional to the force's magnitude, moving in the same direction as the force, and inversely proportional to the mass of the object.

According to Newton's First Law, when  the truck collided with the car, an external, unbalanced force operates on both the truck and the vehicle in a collision with a truck, causing the truck to suddenly slow down to rest and accelerate from rest. In case they are belted up, the other occupants in the vehicle are similarly propelled forward from a stop. You will be moving along with the car when you are securely fastened to it.

According to Newton's second law, the impact of force will be grater for smaller mass, that is, the smaller mass in between the truck and the car experiences greater change in velocity.

Learn more about Newtons first law of motion refer the link:

https://brainly.com/question/974124

#SPJ6

I believe it is surface waves because it happens at the surface of the water.

Answer:

Option (1)

Explanation:

Ripples (ripple marks) are formed due to the forward and backward motion of water over the surface of a rock bed or water bodies. They are usually formed when the flow velocity is less and the diameter of the grains is relatively small.

These are sedimentary structures that are found in many places. These ripples are divided into 2 types, namely the symmetric and the asymmetric ripples. Asymmetrical ripples are helpful in identifying the palaeocurrent direction.

These are formed when water travels over the surface, so it can be considered as the surface waves.  

Hence, the most appropriate answer is option (1).

Given that ;

Energy (work ) Produced by bulb =20 KJ = 20000 J

Input power = 15 KW

Output power given by the bulb  = Rate of doing work

                                                   = Work ÷ time

                                                   = 20000 ÷ 1800   (since 1 min = 60 seconds)

                                                   = 11.11 W

Noe, efficiency is the ratio of output power to input power

                                                   η = output power ÷ input power

                                                      = 11.11 ÷ 15

                                                      = 0.74

                                                      = 74%

Efficiency of light bulb is 74%

If you liked the procedure, please give me brainliest

Answer:

According to Newton’s first law of motion, a force must act on it to move an object at rest.

Explanation:

According to the Newton's first law of motion, for an object to change its velocity (either a change in the magnitude or the direction), there must be a cause to it which is defined as a net external force.

So for an object to move from rest, an external force must be applied to it.

Final answer:

According to Newton's first law of motion, to move an object at rest, a net external force must be applied. This law, also known as the law of inertia, indicates that an object will not change its state of motion without the influence of an external force. This demonstrates the connection between motion and forces.

Explanation:

According to Newton’s first law of motion, for an object at rest to move, it must be acted upon by a net external force. This law, also known as the law of inertia, explains that without such a force, an object will remain in its current state, whether that is at rest or in motion at a constant velocity. The crucial point is that any change in motion - initiating movement from rest, altering speed, or changing direction - requires the influence of a net external force. This force could be anything from a push or pull, to gravity or friction acting on the object.

The common observation that objects naturally tend to slow down and come to a halt is not due to inertia but rather the result of frictional or other forces acting against the object’s motion. Therefore, to move an object at rest, a force must be applied that is greater than the resisting forces, such as friction. This illustrates the fundamental nature of motion and forces as described by Newton’s first law.

Lets say that:

Eric is E

Sheena is S

Yael is Y

We know that S+2=Y, E= 1/S and that E+S+Y=52. So, we can insert S+2=Y and E= 1/S into our other equation, which would bring us to (1/2S)+(S+2)+S=52. This is equal to 1/2S+S+2+S=52. We then use algebra to get the answer:

Given:

S+2=Y

E=1/S

E+Y+S=52

Equation:

1/2S+S+2+S=52

1/2S+S+S=52

2.5S=50

S=50/2.5

S=20

And since Yael has 2 more points then Yael then we do 20+2 and get 22.

Hope this helps! <3

The Average speed can be found by dividing the total traveled by the amount of time it took to travel that distance.

For example, if it took you 10 hours to travel 100 miles, your average speed is the amount of miles you traveled in 1 hour. Simplify.

100/10 = 10/1

Your average speed is 10 miles per hour.

~

Convection occurs because the oceanic waters heat up becoming less dense. This water moves above the cooler water, and give off its heat to the surrounding environment. As it cools, it begins to sink, and the process begins again.

The correct answer is Option B.

Explanation: When a fluid is heated unevenly, it starts moving in convection cells, carrying thermal energy from its warmer parts to its colder parts. Such motion due to temperature differences is called a convection current. Ocean currents may be considered convection currents because warm water rises and cold water moves in to replace it. Warm currents carry thermal energy from warmer regions near the equator toward the poles. Cold currents move toward the equator, making the temperature there lower than it would be otherwise.

Given that

Force (F) = 15 N ,

mass (m) = 5 Kg ,

acceleartion = ?

              We know that, From Newtons II law

                      F = m. a

                    15 = 5 × a

                     a = 15÷ 5

                       a = 3 m/s²

acceleration of the ball is 3 m/s²

The correct tool a student can use to identify what type and how many atoms are in a chemical compound is the International Union of Pure and Applied Chemistry (IUPAC) nomenclature.

The IUPAC nomenclature is a systematic method of naming chemical compounds based on their molecular structure. It provides a standardized way to communicate information about the composition and structure of molecules, including the types of atoms present and their arrangement. By using IUPAC names, one can deduce the molecular formula, which indicates the number and type of atoms in the compound.

For example, the IUPAC name for the compound ethanol is ethyl alcohol. From this name, we can determine that the compound contains two carbon atoms (eth- indicates an ethyl group, C2H5), one oxygen atom (the suffix -ol indicates an alcohol group, -OH), and six hydrogen atoms (since the ethyl group has five hydrogen atoms and the alcohol group has one). Thus, the molecular formula for ethanol is C2H6O, which accurately represents the number and type of atoms in the compound.

Common names and chemical names provided by societies like the National Chemistry Society can sometimes be used to identify compounds, but they may not always provide clear information about the molecular structure or the exact number of each type of atom. These names can be ambiguous or vary by region and language, whereas IUPAC nomenclature is internationally recognized and provides a clear and unambiguous description of the compound's composition.

Therefore, the IUPAC nomenclature is the most reliable tool for a student to use during a test to determine the type and number of atoms in a chemical compound.

When volcanoes erupt, they emit a mixture of gases and particles into the air. Some of them, such as ash and sulphur dioxide, have a cooling effect, because they (or the substances they cause) reflect sunlight away from the earth. Others, such as CO2, cause warming by adding to the the greenhouse effect.

Volcanoes can have long-term effects on the climate, making the world cooler.

Hope this helps☺

Answer:

Shine lasers of various colors at a narrow slit in an index card and measure the distance between the bright spots.

Explanation:

When the light passes through the narrow opening or the obstacles, it bends. This process is called the diffraction of light. The experiment to investigate the wavelength on the diffraction pattern is " to find the wavelength of laser light with the help of diffraction process ".

In this experiment, a laser light, a slit and the detector is placed on the optical bench. Then the laser light is passes on the slit and diffraction pattern can be seen in the screen.

So, the correct option that shows the best experiment to investigate the wavelength on the diffraction pattern is " Shine lasers of various colors at a narrow slit in an index card and measure the distance between the bright spots ".

Thus, Aristotle believed that the laws governing the motion of the heavens were a different set of laws than those that governed motion on the earth. As we have seen, Galileo's concept of inertia was quite contrary to Aristotle's ideas of motion: in Galileo's dynamics the arrow (with very small frictional forces) continued to fly through the air because of the law of inertia, while a block of wood on a table stopped sliding once the applied force was removed because of frictional forces that Aristotle had failed to analyze correctly.Thus, Aristotle believed that the laws governing the motion of the heavens were a different set of laws than those that governed motion on the earth. As we have seen, Galileo's concept of inertia was quite contrary to Aristotle's ideas of motion: in Galileo's dynamics the arrow (with very small frictional forces) continued to fly through the air because of the law of inertia, while a block of wood on a table stopped sliding once the applied force was removed because of frictional forces that Aristotle had failed to analyze correctly.Thus, Aristotle believed that the laws governing the motion of the heavens were a different set of laws than those that governed motion on the earth. As we have seen, Galileo's concept of inertia was quite contrary to Aristotle's ideas of motion: in Galileo's dynamics the arrow (with very small frictional forces) continued to fly through the air because of the law of inertia, while a block of wood on a table stopped sliding once the applied force was removed because of frictional forces that Aristotle had failed to analyze correctly.Thus, Aristotle believed that the laws governing the motion of the heavens were a different set of laws than those that governed motion on the earth. As we have seen, Galileo's concept of inertia was quite contrary to Aristotle's ideas of motion: in Galileo's dynamics the arrow (with very small frictional forces) continued to fly through the air because of the law of inertia, while a block of wood on a table stopped sliding once the applied force was removed because of frictional forces that Aristotle had failed to analyze correctly.Thus, Aristotle believed that the laws governing the motion of the heavens were a different set of laws than those that governed motion on the earth. As we have seen, Galileo's concept of inertia was quite contrary to Aristotle's ideas of motion: in Galileo's dynamics the arrow (with very small frictional forces) continued to fly through the air because of the law of inertia, while a block of wood on a table stopped sliding once the applied force was removed because of frictional forces that Aristotle had failed to analyze correctly.Thus, Aristotle believed that the laws governing the motion of the heavens were a different set of laws than those that governed motion on the earth. As we have seen, Galileo's concept of inertia was quite contrary to Aristotle's ideas of motion: in Galileo's dynamics the arrow (with very small frictional forces) continued to fly through the air because of the law of inertia, while a block of wood on a table stopped sliding once the applied force was removed because of frictional forces that Aristotle had failed to analyze correctly.Thus, Aristotle believed that the laws governing the motion of the heavens were a different set of laws than those that governed motion on the earth. As we have seen, Galileo's concept of inertia was quite contrary to Aristotle's ideas of motion: in Galileo's dynamics the arrow (with very small frictional forces) continued to fly through the air because of the law of inertia, while a block of wood on a table stopped sliding once the applied force was removed because of frictional forces that Aristotle had failed to analyze correctly.Thus, Aristotle believed that the laws governing the motion of the heavens were a different set of laws than those that governed motion on the earth. As we have seen, Galileo's concept of inertia was quite contrary to Aristotle's ideas of motion: in Galileo's dynamics the arrow (with very small frictional forces) continued to fly through the air because of the law of inertia, while a block of wood on a table stopped sliding once the applied force was removed because of frictional forces that Aristotle had failed to analyze correctly.

Galileo Galilei's mind opens to physics, and nature controls laws that can be mathematically formulated and written in Sagiatori in 1623:

"There is a philosophy in this great book, the book of the universe, which is always open to us, but we can not understand the book if we do not know the language in which it was written and we do not try to learn the letters ... One can not understand even one word of nature and the universe, Human in a large dark lobby ".

2 - Aristotle believed that the nature of the "first engine" eternal is the source of the infinite movement, and that it is valid and exist outside the universe.

Aristotle is one of the ancient Greek scientists who worked on the interpretation of nature based on their competence in observation, reasoning and reasoning, starting with what they considered truthful facts and analyzing them carefully, believing that this would lead them to the correct conclusions.

By following this philosophy, they undoubtedly reached a number of sound conclusions, including that the universe was governed by a particular system, but there was a fundamental weakness in their philosophy, and their ability to observe was limited because they relied only on their abstract senses. . Many scientists, including Aristotle, for example, thought that planets and stars revolve around Earth, an idea that was then self-evident, and Charles Freeman, in his book "Closing Western Thought." Earth is the center of the universe. "

Answer:

3.143 m/s

Explanation:

m1 = 9 kg

u1 = 14 m/s

m2 = 12 kg

u2 = - 5 m/s

Let the velocity after the collision is V

By using the principle of conservation of momentum

Momentum of two bodies before collision = momentum of two bodies after collision

m1 x u1 + m2 x u2 = (m1 + m2) x V

9 x 14 - 12 x 5 = (9 + 12) x V

126 - 60 = 21 x V

V = 3.143 m/s

Thus, the velocity of the sticked bodies after the collision is given by 3.143 m/s.

To find the final velocity of two colliding masses sticking together, use the conservation of momentum equation. The total momentum before collision equals total momentum after collision, yielding a final velocity of 3.14 m/s to the right.

To find the final velocity of the combination of the two masses after the collision, we can use the principle of conservation of momentum. The total momentum before the collision is equal to the total momentum after the collision.

Step-by-Step Solution:

Determine the initial momenta of each mass:

Momentum of the 9.00 kg mass:

p₁ = m₁v₁

p₁ = 9.00 kg × 14.0 m/s

p₁ = 126 kg·m/s (to the right)

Momentum of the 12.0 kg mass:

p₂ = m₂v₂

p₂ = 12.0 kg × (-5.00 m/s)

p₂ = -60 kg·m/s (to the left)

Add the momenta to find the total initial momentum:

[tex]p_{total[/tex] = p₁ + p₂

[tex]p_{total[/tex] = 126 kg·m/s - 60 kg·m/s

[tex]p_{total[/tex] = 66 kg·m/s

Calculate the total mass after the collision:

[tex]m_{total[/tex] = m₁ + m₂

[tex]m_{total[/tex] = 9.00 kg + 12.0 kg

[tex]m_{total[/tex] = 21.0 kg

Using the conservation of momentum, the combined mass's final velocity (vf) is given by:

[tex]v_f[/tex] = [tex]p_{total[/tex] / [tex]m_{total[/tex]

[tex]v_f[/tex] = 66 kg·m/s / 21.0 kg

[tex]v_f[/tex] = 3.14 m/s

Therefore, the final velocity of the combination after the collision is 3.14 m/s to the right.

Her average speed would be 30 kilometers in a hour.

Answer: Her average speed would be 30 kilometers per hour because 60 divided by two is 30 which is how you can calculate the average speed if desired.

Hope this helps!  :)

Explanation:

The answer is b. after is and ways. You always pause after a comma before moving on to the rest of the sentence.

Answer:

Explanation:

It's none of the above. The sentence is complete the way it stands. There is no need for any more punctuation.

So the answer is D.

Answer:

Given that

Speed  =  60 Km/hr

 In one hour, how much distance travelled by car

    We know that

             Distance = Speed × time

                     S = 60 × 1

                    S =  60 Km

In one hour car will travel 60 Km