Which part of the light waves does color correspond to ?

Answer:

10.39 OR 10.4 m at 46.6° downward or clockwise with +xaxis or 313.4° in anticlockwise direction with + X-axis

Explanation:

D =  SQUARE ROOT OF(7.14^2 +(-7.55)^2)

 D = 10.39 m

as Dx is positive and Dy IS NEGATIVE hence vector is in 4 th quadrant

tan α= 7.55/7-14

        = 1.057

α = 46.6° downward or clockwise with +xaxis

or  α =313.4° in anticlockwise direction with + X-axis

Answer:

A steep slope on a displacement vs. time graph indicates a large velocity.

Explanation:

Answer:

Decreases

Explanation:

Ideal gas law:

PV = nRT

where P is absolute pressure,

V is volume,

n is number of moles,

R is gas constant,

and T is absolute temperature.

If V is constant and T decreases, then P must decrease.

In accordance with Boyle's Law, if the volume of a scuba tank remains constant and its temperature decreases, then the pressure of the air within the tank would increase. This principle is applied in underwater activities to ensure safe ascension and descension by divers.

The scenario you're describing falls under the principles of Boyle's law in physics, which applies to scenarios where gases are held at a constant volume. Boyle's law states that the pressure and temperature of a gas have an inverse relationship when held at a constant volume. If we apply this to your question, it implies that if the volume of air in the scuba tank remains constant and its temperature decreases, the pressure within the tank would increase.

For instance, if divers descend into the deep waters, the increase in water pressure compresses the air pocket within the scuba tank, and this increase in pressure subsequently raises the tank's temperature. A reverse scenario will occur during ascent. As divers begin to ascend and water pressure reduces, the air pocket within the scuba tank expands, resulting in a decrease in pressure, subsequently causing the tank's temperature to decrease as well.

The relationship between temperature, volume, and pressure is crucial in subaquatic activities to prevent potential mishaps like ruptured lungs or eardrums due to rapid pressure change.

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The net force is 6 N East

Explanation:

First of all, we start by noticing that all the forces act along the direction East-West, so we can simply find the net force by using algebraic addition.

In order to find the net force on the wheelchair, we need to define a positive direction and write down all the force with the proper sign.

Let's choose East as positive direction. Therefore, we have the following forces:

[tex]F_1 = +10 N[/tex] (east), the force applied by Ms. PB

[tex]F_2 = +5 N[/tex] (east), the force applied by Mr. Rigney

[tex]F_f = -2 N[/tex] (west), the frictional force, acting in the opposite direction

[tex]F_r = -7 N[/tex] (west), the air resistance, acting in the opposite direction

Taking into account the correct signs, we can now find the net force on the wheelchair:

[tex]F=F_1+F_2+F_f+F_r = +10 + 5 +(-2) + (-7) = +6 N[/tex]

And the positive sign tells us that the direction of the net force is East.

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Answer:

it is potential energy

Explanation:

There is no movement taking place, so it can't be kinetic. There are no chemical reactions, so it isn't chemical energy, and gravity does not take part in the stretching of a rubber band. The stretched spring or rubber band has lots of energy ready to go at any point, but it is not being used at the moment, so it is potential energy.

Answer:

According the law of conservation of mass, the mass of  the reactant should be equal to the products in an chemical reaction. so we go far balancing the chemical reactions.

1)    [tex]S +O_2 \rightarrow SO_2[/tex]

2)   [tex]2Na + O_2 \rightarrow Na_2O_2[/tex]

3)   [tex]2Hg + O_2 \rightarrow 2HgO[/tex]

4)   [tex]2Ag_2O \rightarrow 4Ag + O_2[/tex]

5)   [tex]Ba(OH)_2 + H_3PO_4 \rightarrow BaHPO_4+ 2H_2O[/tex]

6)   [tex]2NaOH + H_3PO_4 \rightarrow Na_2HPO_4 +2H_2O[/tex]

7)   [tex]C_4H_8 + 6O_2\rightarrow 4CO_2+4H_2O[/tex]

8)   [tex]C_3H_8 + 5O_2\rightarrow3CO_2+4H_2O[/tex]

9)   [tex]2Fe + 3Cl_2\rightarrow 2FeCl_3[/tex]

10)  [tex]2Al+6HCl \rightarrow2 AlCl_3 +3H_2[/tex]

11)   [tex]2H_2 +O_2 \rightarrow 2H_2O[/tex]

12)   [tex]N_2 + 3H_2 \rightarrow 2NH_3[/tex]

Answer:

Centripetal acceleration is the acceleration of an object traveling in a circle, while linear acceleration is the acceleration of an object traveling in a straight line.

Answer:

Centripetal acceleration is the acceleration of an object traveling in a circle, while linear acceleration is the acceleration of an object traveling in a straight line. ... Meanwhile linear acceleration is the rate of change of linear velocity, which is the velocity of an object traveling in a straight line.

Answer:

physical quantity that only has magnitude and no other characteristics.

Explanation:

so no velocity only magnitude

Answer:

Time and speed is a pair of scalar quantities.

Explanation:

this questions answer choices  are  imcomplete  it should be like this .

Which of the following is a pair of scalar quantities?

A.) velocity - distance

B.) velocity - displacement

C.) time - speed

D.) time - displacement

Answer:

B. 68.6m

Explanation:

Free Fall Motion

When a body is left to move in the air with no friction, the motion is ruled only by the force of gravity. The vertical distance a body travels in the air after a time t is .

[tex]\displaystyle y=\frac{gt^2}{2}[/tex]

We know the egg takes 3.74 seconds to reach the ground. The height it was launched from is

[tex]\displaystyle y=\frac{(9.8)(3.474)^2}{2}[/tex]

[tex]\displaystyle y=68.54\ m[/tex]

The closest correct option is

B. 68.6m

Gravitational potential energy is converted into kinetic energy

Explanation:

There are two forms of energy involved in the situation described in the problem:

In this problem, Sonja and the bike starts from the top of the hill and they ride downhill. As they go downhill, their altitude from the ground (h) decreases, so their gravitational potential energy decreases; at the same time, since the total energy is conserved (in absence of friction or air resistance), the speed of the bike and Sonja increases, and their kinetic energy increases. Therefore, there is a conversion of energy from gravitational potential to kinetic.

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Answer:

(a) [tex]R_5=9\ \Omega[/tex]

(b) Potential Difference = 11.584 V

(c) [tex]R_1=0.40\ \Omega[/tex]

Explanation:

Given:

[tex]\textrm{Current in A₁,}I_1=0.4\ A\\\textrm{Current in A₂,}I_2=0.64\ A\\R_2=5.6\ \Omega\\R_3=6.2\ \Omega\\R_4=8.2\ \Omega\\\textrm{EMF of the battery,}E= 12 V[/tex]

(a)

The resistances [tex]R_3\ and\ R_4[/tex] are in series. So, equivalent resistance is the sum of the two.

[tex]R_s=R_3+R_4=8.2+6.2=14.4\ \Omega[/tex]

Now, [tex]R_s\ and\ R_5[/tex] are in parallel. So, potential difference across both the terminals is same. Therefore,

[tex]I_1R_s=I_2R_5\\\\R_5=\frac{I_1}{I_2}R_s\\\\R_5=\frac{0.4}{0.64}\times 14.4=9\ \Omega[/tex]

(c)

Now, since the resistances are in parallel, the equivalent resistance is given as:

[tex]\frac{1}{R_p}=\frac{1}{R_s}+\frac{1}{R_5}\\\\R_p=\frac{R_s\times R_5}{R_s+R_5}\\\\R_p=\frac{14.4\times 9}{14.4+9}\\\\R_p=\frac{129.6}{23.4}=5.54\ \Omega[/tex]

Now, resistances [tex]R_1,R_2\ and\ R_p[/tex] are in series. Therefore, equivalent resistance is given as:

[tex]R_{eq}=R_1+R_2+R_p\\R_{eq}=R_1+5.6+5.54\\R_{eq}=R_1+11.14-----1[/tex]

Now, from Ohm's law, we know that,

[tex]E=(I_1+I_2)R_{eq}\\\\R_{eq}=\frac{E}{I_1+I_2}\\\\R_{eq}=\frac{12}{0.4+0.64}\\\\R_{eq}=11.54\ \Omega[/tex]

Plug in [tex]R_{eq}[/tex] value in equation (1). This gives,

[tex]11.54=R_1+11.14\\R_1=11.54-11.14=0.40\ \Omega[/tex]

(b)

Now, potential difference across the terminals of the battery is given as:

[tex]V=E-(I_1+I_2)R_1\\V=12-(0.4+0.64)0.4\\V=12-0.416=11.584\ V[/tex]

Answer:

Normal force of 10,000N

Explanation:

From the question, the weight the car exerts on the pavement is 10,000N.

The pavement exerts upward and perpendicular contact force called normal force on the car to support its weight. Also, the normal force is equal and opposite to the weigh of the car.

Hence the pavement exerts normal force of 10,000N back on the car to prevent it from passing through it.

Final answer:

The pavement exerts an equal and opposite force of 10,000 newtons back on the car due to Newton's third law of motion. The net force and net torque on a stationary car parked on level pavement are zero.

Explanation:

If a car parked on level pavement exerts a force of 10,000 newtons (N) on the ground, the pavement exerts an equal and opposite force of 10,000 N back on the car. This is due to Newton's third law of motion, which states that for every action, there is an equal and opposite reaction.

In this case, the action is the force of the car's weight on the pavement, and the reaction is the normal force exerted by the pavement on the car. The force exerted by the pavement is also known as the support force and it is what prevents the car from sinking into the ground.

The net force on the car when it is parked and at rest on level pavement is zero because the downward gravitational force (weight of the car) is balanced by the upward normal force from the pavement. Similarly, the net torque on the car is also zero, assuming no other external forces are acting on it, such as wind or a slope that could create a rotational effect.

Final answer:

The loudness of a sound is primarily determined by the amplitude of the sound wave, where larger amplitudes result in louder sounds. This is measured in decibels (dB). The perceived loudness also depends on the force of vibration and the frequency sensitivity of the human ear.

Explanation:

The loudness of sound is determined by the amplitude of vibration. The amplitude, or height of the sound wave, dictates how much energy it carries, subsequently influencing its perceived loudness or volume.

A wave with a larger amplitude carries more energy, resulting in a louder sound, while a smaller amplitude corresponds to a softer sound. This is why sound C in a diagram with higher amplitude waves is louder than sound B with lower amplitude waves.

Loudness is often measured in decibels (dB), with larger waves and consequently greater amplitudes reflected in higher decibel levels. As an example, a typical conversation may measure around 60 decibels, considerably louder than a faint whisper at 30 decibels, illustrating the impact of amplitude on the loudness of sounds we encounter daily.

However, the strength of the sensation, or intensity, also plays a role, mainly governed by the force behind the vibrating body - more force results in a wider vibration and greater intensity.

Yet, the ear's sensitivity to different frequencies also affects perceived loudness; we may perceive sounds as louder if they are within the frequency range where the ear is most sensitive.

Answer:

1 percent

Explanation:

It says that only 3 percent of the water is fresh. So it can be 1 percent or 3 percent. But then it says that most of the water is locked up in glaciers and polar ice caps. So the animals would have a hard time getting to this water. So the rest is available for them. Approximately 1 percent is most reasonable.

Answer:

1 percent (A)

Answer:

0.241

Explanation:

resolving weight into two components and calculating force of friction in terms of coefficient of friction and then applying Newton 's law we get the value .This all has been explained in attachment

Final answer:

To calculate the coefficient of friction for a box sliding down a ramp, we consider the forces acting on the box, including gravity, normal force, and friction. The frictional force equals the coefficient of friction times the normal force that comes out to be 0.24

Explanation:

To find the coefficient of friction for a 10 kg box accelerating down a ramp at 2 meters per second² at an angle of 25 degrees, we can use the following physics concepts. First, we identify the forces acting on the box: gravity, normal force, friction, and the resultant force causing the acceleration. We can calculate the component of the gravitational force parallel to the ramp (which is mg sin(25°)), and the normal force (which is mg cos(25°), where m is the mass of the box and g is the acceleration due to gravity).

The frictional force ([tex]F_{f}[/tex]) opposes the motion and can be expressed as [tex]F_{f}[/tex] = μN, where μ is the coefficient of static friction and N is the normal force. Since the box is accelerating, we set up Newton's second law of motion in the direction of the incline: [tex]F_{parallel}[/tex] - [tex]F_{f}[/tex] = ma, where a is the acceleration. Substituting the expressions for [tex]F_{parallel}[/tex], [tex]F_{f}[/tex], and N and solving for μ gives us the coefficient of friction.

Given: Mass (m) = 2 kg, Incline angle (θ) = 25°, Frictional force ([tex]F_{f}[/tex]) = 4.86 N . We get that by using the formula [tex]F_{f}[/tex] = μ * m * g * cos(θ), where g = 10 m/s² .

Now from[tex]F_{f}[/tex] = μN

Substitute the values to find μ = 0.24.

Answer:

the answer is D.

Explanation:

Acceleration means you can increase in speed, decrease in speed, and change directions. BUT, velocity means speed with a direction. If you want to accelerate, it's impossible to keep the same velocity at the same time.

Answer: The electromagnetic waves reach Earth, while the mechanical waves do not.

Explanation:

Answer:

(B) The electromagnetic waves reach Earth, while the mechanical waves do not.

Explanation:

Electromagnetic waves do not require material medium for their propagation, so it will reach the Earth. Mechanical waves require material medium for their propagation, so mechanical waves will not reach Earth.

Therefore, the correct option is B "The electromagnetic waves reach Earth, while the mechanical waves do not".

The equivalent resistance of the parallel circuit with three resistors is determined as 1.64 ohms.

The equivalent resistance of the parallel circuit is determined as follows;

¹/R = ¹/R₁ + ¹/R₂ + ¹/R³

¹/R = ¹/3 + ¹/6 + ¹/9

¹/R =   (6 + 3 + 2)/18

¹/R = 11/18

R = 18/11

R = 1.64 ohms

Thus, the equivalent resistance of the parallel circuit with three resistors is determined as 1.64 ohms.

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Final answer:

The equivalent resistance of the circuit with three resistors in parallel (3.0 Ohms, 6.0 Ohms, 9.0 Ohms) is approximately 1.636 Ohms.

Explanation:

To find the equivalent resistance of a circuit consisting of resistors in parallel, one must use the formula for parallel resistors, which is 1

In this case, the circuit has three resistors in parallel with resistances of 3.0 Ohms, 6.0 Ohms, and 9.0 Ohms. Hence, the calculation for the equivalent resistance (R_eq) is:

1/R_eq = 1/3.0 Ohms + 1/6.0 Ohms + 1/9.0 Ohms

1/R_eq = 1/3 + 1/6 + 1/9

1/R_eq = 6/18 + 3/18 + 2/18

1/R_eq = 11/18

Now, take the reciprocal to find the equivalent resistance:

R_eq = 18/11 Ohms

R_eq ≈ 1.636 Ohms

Therefore, the equivalent resistance of the three parallel resistors is approximately 1.636 Ohms.

Answer:

Option A

A model

Explanation:

Modelling is the process where the designer simulate elements that resemble the actual product and put on a scale that the computers can easily simulate and then the simulations are related directly to the actual product. The use of computer simulations to help solve problems is known as modelling since it uses a model.

Final answer:

The use of computer simulations in engineering, such as for bridge design, is characterized as a model. These simulation models are used for testing hypotheses and making predictions, acting as pivotal tools in design and decision-making processes.

Explanation:

The use of computer simulations, such as the ones employed in designing the Millennium Bridge in London, is best described as a model. These simulation models use numerical techniques to visualize and analyze complex relationships and scenarios in various designs and systems. They are built around hypotheses and can be used to test these hypotheses, as well as to make predictions about the system under study. Moreover, simulations are a substitute for experimentation and the results should be verified through experimentation or observational data.

Computer models, which have been verified against data, are incredibly useful in aiding decision-making processes, including those in engineering. For instance, they help in modeling high-altitude winds for planning airliner flight paths or storm paths for emergency procedures, as well as designing solutions to reduce friction or drag, such as in making cars more fuel-efficient. Therefore, a computer simulation in engineering functions both as a predictive tool and a virtual experiment.

Answer:

The ball rolled a distance of 54 m.

Explanation:

Given:

Initial velocity of the ball is, [tex]u=5\ m/s[/tex]

Final velocity of the ball is, [tex]v=7\ m/s[/tex]

Time for rolling is, [tex]t=9\ s[/tex]

The distance of rolling is, [tex]S=?[/tex]

First, let us find the acceleration of the ball using Newton's equation of motion as:

[tex]v=u+at\\a=\frac{v-u}{t}\\a=\frac{7-5}{9}=\frac{2}{9}\ m/s^2[/tex]

Now, displacement of the ball can be determined using the following equation of motion:

[tex]v^2=u^2+2aS[/tex]

Rewriting the above in terms of 'S', we get

[tex]S=\frac{v^2-u^2}{2a}[/tex]

Plug in the known values and solve for 'S'. This gives,

[tex]S=\frac{7^2-5^2}{2\times \frac{2}{9}}\\\\S=\frac{49-25}{\frac{4}{9}}\\\\S=\frac{9\times 24}{4}\\\\S=9\times 6=54\ m[/tex]

Therefore, the ball rolled a distance of 54 m.

Answer:

the ray is reflected infinite number of times by 2 plane mirrors placed parallel to each other as each reflected ray would be the incident ray for the other.

Explanation:

the ray is reflected infinite number of times by 2 plane mirrors placed parallel to each other as each reflected ray would be the incident ray for the other.

Placing one mirror at an angle causes reflections to curve.

Two parallel plane mirrors result in an infinite number of reflections for a light ray due to the Law of Reflection.

When two plane mirrors are placed parallel and facing each other, a light ray entering this setup will undergo multiple reflections between the mirrors. The number of reflections theoretically can be infinite, as each reflection leads to another unless the mirrors are not perfectly aligned or have imperfections. This principle is based on the Law of Reflection, which states that the angle of incidence is equal to the angle of reflection.

Here's a step-by-step explanation:

This phenomenon can be commonly observed in simple experiments using two parallel mirrors, creating the effect of an infinite tunnel of reflections.

Answer:

2 protons, 2 electrons and 1 neutron

Explanation:

Answer:

Let's begin by explaining that the electromagnetic spectrum is the set of electromagnetic radiations distributed in their different frequencies or wavelengths. So, if we go from the smallest wavelengths known up to now (because according to physics the electromagnetic spectrum is infinite and continuous) to the longest, the electromagnetic spectrum covers the following radiations:  

Gamma rays, X-rays, ultraviolet, visible light, infrared, radio waves and microwaves:

-Gamma rays: With a wavelength in the order of [tex]10^{-12}m [/tex], is a type of ionizing radiation capable of penetrating matter quite deeply and is able to cause serious damage to the nucleus of the cells.

-X rays: With a wavelength between [tex]1m[/tex] and [tex]10km[/tex]. It is invisible to the human eye, capable of crossing opaque bodies and is also an ionizing radiation.

-Ultraviolet light (UV): Whose wavelength is approximately between 100 nm and 380 nm; is a type of electromagnetic radiation that is not visible to the human eye.  

-Visible light: This part of the spectrum is located between ultraviolet light and infrared light (400 nm - 800 nm). It should be noted, the fact the only part of the whole electromagnetic spectrum is visible to humans is because the receptors in our eyes are only sensitive to these wavelengths.

-Infrared: This type of radiation is not visible to the human eye, since its wavelengths are outside the visible spectrum (between 700 nm and 1 mm).  

These waves can be divided into:  

- Near infrared or long wave infrared: it is the least sensitive to color and is easily absorbed by water.  

- Medium or medium wave infrared: it is also insensitive to color and easily absorbed by water and many types of plastics and paints.  

- Far infrared or short wave infrared: it is more penetrating than the long wave and is good for heating metals, these waves also can pass through clear materials.  

This light has many uses, including heating lamps in physiotherapy and medical treatments, heat sensing devices, among others.

-Radio waves: This is a type of electromagnetic radiation with wavelengths between 10 m to 10,000 m. This type of electromagnetic waves is very well reflected in the ionosphere, the layer of the atmosphere through which they travel directly or using repeaters. In addition, this radiation is important in telecommunications.

Answer:

A Anemia

Explanation:

Anemia is a condition in which you lack enough healthy red blood cells to carry adequate oxygen to your body's tissues. Having anemia can make you feel tired and weak. There are many forms of anemia, each with its own cause. Anemia can be temporary or long term, and it can range from mild to severe.

Answer:

18.4 kcal

Explanation:

ΔQ = m c Δ t

where ΔQ is heat energy supplied in kcal , m is mass in kg , c is specific heat capacity which is 0.092 kcal / (kg C°) ,  Δ t = 110-10= 100C°

ΔQ = 2×0.092×100 = 18.4 kcal

Answer:

heat = 20 Kcal

Explanation:

Answer:

3.57 units

Explanation:

[tex]x =\sqrt{ (-1.55)^2+(3.22)^2} = 3.57 units[/tex]

Answer:

The magnitude of the vector is 3.57 units.

Explanation:

The x component of the vector, [tex]v_x=-1.55\ \text{units}[/tex]

The y component of the vector is [tex]v_y=3.22\ \text{units}[/tex]

We need to find the magnitude of the vector. We know that the magnitude of the vector is given by :

[tex]v=\sqrt{v_x^2+v_y^2}[/tex]

[tex]v=\sqrt{(-1.55)^2+(3.22)^2}[/tex]

[tex]v=3.57\ \text{units}[/tex]

So, the magnitude of the vector is 3.57 units. Hence, this is the required solution.

Final answer:

A low melting point is not a common property of ionic compounds; they are characterized by high melting points, being hard and brittle, and conducting electricity when molten but not as a solid.

Explanation:

The property that is not common to ionic compounds is having a low melting point. Ionic compounds are known for their distinctive characteristics, which include being hard, brittle, and capable of conducting electricity as a liquid but not as a solid.

They typically have high melting points and high boiling points. When they are solid, the ionic compounds have ions that are held in place and cannot move, which means they do not conduct electricity. However, when these compounds are in a molten state (liquid), the ions can move freely, and this allows the compound to conduct electricity.

The cruise liner’s speed when it collided with the iceberg if it had a mass of 4.23 x 108 kg ship and a momentum of 4.9 x 109 kg·m/s is v= 11.584 m/s

Explanation:

Given :

The cruise liner’s speed when it collided with the iceberg has a

Mass (m) = 4.23 x 108 kg  and

Momentum (p) = 4.9 x 109 kg m/s

To calculate the momentum,

We need to use the formula of a momentum

Momentum = Mass x Velocity ( p = m v )

as we need to find the velocity the formula becomes

velocity = momentum / mass

v = p / m

= (4.9 x 109 kg m/s) / (4.23 x 108 kg)

v= 11.584 m/s

Answer:

The term thermodynamics comes from the Greek words therme (heat)  and dynamis (force)

Explanation:

Thermodynamics can be defined as the science of energy. Thought everything  the world has an idea of what energy is, it's hard to define it precisely.

Energy can be considered as the ability to cause change.

The term thermodynamics comes from the Greek words therme (heat)  and dynamis (force), which corresponds to the most descriptive of the first  efforts to convert heat into energy. At present, the concept is  interpret broadly to include Energy Aspects and their transformations,  including power generation, cooling and relationships  among the properties of matter.

The study of thermodynamics examines how heat, work, temperature, and energy are related. The general topic of thermodynamics is the transfer of energy from one location or form to another.

The fundamental idea is that heat is a type of energy that is equivalent to a specific quantity of mechanical labor.

Although the necessity to improve the performance of steam engines prompted the fast development of thermodynamics throughout the 19th century, the principles of thermodynamics are so broadly generic that they apply to all physical and biological systems.

The rules of thermodynamics, in particular, provide a thorough explanation of all changes in a system's energy state and its capacity to do beneficial work on its surroundings.

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Answer:

10.0 J

Explanation:

The work done equals the change in energy.  Since there's no friction, and the table is horizontal, the only change in energy is kinetic.

The total kinetic energy gained by the object of  20 Newton weight is 10.0 joules.

According to the law of conservation of energy, energy cannot be created or destroyed. It can, however, be transformed from one form to another. When all forms of energy are considered, the total energy of an isolated system remains constant. The law of energy conservation applies to all forms of energy.

In summary, the law of energy conservation states that the total energy of a closed system, that is, a system that is isolated from its surroundings, is conserved.

Total work done on the object is 10.0 joules.

Weight if the object = 20 Newton.

Hence, total kinetic energy gained by the object = Total work done on the object

= 10.0 joules.

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