A 10 kg rock falls from a 20 m cliff. What is the kinetic and potential energy when the rock has fallen 10 m?

The kinetic and potential energy when  the rock that has fallen 10 m will be 981 J and 981 J, respectively.

Given information:

A 10 kg rock falls from a 20 m cliff.

At the height of 20 m, the kinetic energy of the rock will be zero because it is at rest. Now, while falling, its potential energy will decrease and kinetic energy will increase.

According to energy conservation, the loss in potential energy from 20 m to 10 m will be converted into kinetic energy.

So, the loss in potential energy or gain in kinetic energy from 20 m to 10 m will be,

So, the kinetic energy of the rock at 10 m height will be 981 J.

Now, the potential energy of the rock at 10 m height will be,

So, the potential energy of the rock at 10 m height will be 981 J.

Therefore, the kinetic and potential energy when  the rock that has fallen 10 m will be 981 J and 981 J, respectively.

For more details, refer to the link:

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Hello!

First, lets calculate potential energy at the 10 meters, for that, lets applicate formula:

Now, lets calculate the kinetic energy, for this, we have the equation:

How you see, we have to calculate the velocity in that instant, for that lets applicate formula:

Good Luck!!

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probably not if net force is zero