Question

she could measure the potential energy in the motionless ball on the pool table, and she could measure the potential energy of the pool stick as it moves to strike the ball, and this proves there was a transformation of energy.

a. she could measure the potential energy in the motionless ball on the pool table, and she could measure the total of these two measurements will be equal to the kinetic energy in the pool ball as it moves to sink the ball, and this proves there was a transformation of energy.

b. she could measure the potential energy when the pool stick is pulled back to strike the ball, and then she could strike the ball. the potential energy in the pool stick and the kinetic energy in the pool stick as it moves to strike the ball should be equal, proving there was a transformation of energy.

c. she could measure the potential energy when the pool stick is pulled back before moving to strike the ball, and she could measure the kinetic energy of the ball in motion after the pool stick strikes it. there should be an equal amount of kinetic energy and potential energy to prove there was a transformation of potential energy to kinetic energy.

d. she could measure the potential energy of the pool ball when it was sitting on the table, and she could measure the kinetic energy of the ball in motion after the pool stick strikes it. there should be an equal amount of potential energy in the motionless ball and kinetic energy in the ball after the stick strikes it to prove there was a transformation of potential energy to kinetic energy.

Explanation:

The problem is about energy transformation (potential to kinetic) in a pool ball scenario. To prove energy transformation, we measure potential energy before (pool stick pulled back, ball motionless - potential energy) and kinetic energy after (ball in motion - kinetic energy). If they are equal, it shows energy transformed. Option D describes measuring potential energy when the ball is still (potential) and kinetic energy when it's moving after the stick strikes (kinetic), with the expectation of equal amounts to prove the transformation. Other options either measure incorrect energies (e.g., B measures pool stick's energy, not the ball's) or misapply the energy states (e.g., A measures total energy which isn't the focus here).

Answer:

D. She could measure the potential energy of the pool ball when it was sitting on the table, and she could measure the kinetic energy of the ball in motion after the pool stick strikes it. There should be an equal amount of potential energy in the motionless ball transformation of potential energy to prove there was a transformation of potential energy to kinetic energy.