Question

What happens to the sum of the ball's kinetic energy and potential energy as the ball rolls from point A to point E? Assume there's no friction between the ball and the ground.

А. The sum decreases.
В. The sum increases.
C. The sum remains the same.
D. The sum always equals zero.​

Answer 1

C. The sum remains the same.

Step-by-step explanation:

The sum of the kinetic and potential energy remains the same as the all rolls from point A to E.

We know this based on the law of conservation of energy that is in play within the system.

The law of conservation of energy states that "energy is neither created nor destroyed within a system but transformed from one form to another".

• At the top of the potential energy is maximum
• As the ball rolls down, the potential energy is converted to kinetic energy.
• Potential energy is due to the position of a body
• Kinetic energy is due to the the motion of the body