13. Harry used the energy stored in his muscles to cycle up a hill. What happened to this energy when he reached the top? A. The energy stored in Harry's musclesbwas destroyed.

B. The energy was returned to Harry's muscles

C. Kinetic energy changed to potential energy.

D. Potential energy changed to kinetic energy.

C. Kinetic energy changed to potential energy.

Explanation:

The kinetic energy is converted to potential energy when he reaches the top of the hill.

As with every system, energy is neither created nor destroyed but transformed from one form to another.

This is from the law of conservation of energy.

Kinetic energy is produced when Harry moves the up the hill. As he reaches the top of the hill and comes to rest, potential energy is formed.

Potential energy is the energy due to the position of a body.

the independent variable, or the one that is intentionally manipulated is the speed.