A 2 kg toy car moves at a speed of 5 m/s. If a child applies a 5N force for 2 m in the same direction the car is already moving, what is the change in kinetic energy of the car?

The change in the kinetic energy of the car is 10 J.

The given parameters;

The acceleration of the car is calculated as follows;

The final velocity of the car is calculated as follows;

The change in the kinetic energy of the car is calculated as follows;

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Explanation:

The kinetic energy of an object is , where is the mass of the object and is the velocity of the object.

The toy car's initial kinetic energy is .

After the child applies a 5N force on it in the same direction, its velocity will increase but its mass will stay the same.

To find the final velocity of the toy car, we can use kinematic equation

We are given and .

To find acceleration:

.

Now substitute into to get .

Using this, we can find the final kinetic energy of the toy car is .

Thus, the change in kinetic energy is (one significant figure).

c. newton's third law of motion

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it