a rock sitting at the top of a steep hill a tennis ball rolling across the court a picture hanging on the wall a piece of wood before it is burned
I gave my students this multiple choice question: Which is the best example of something that has kinetic energy?

Only one answer is correct among these 4 choices:
- a rock sitting at the top of a steep hill
- a tennis ball rolling across the court
- a picture hanging on the wall
- a piece of wood before it is burned

Could you tell me which one is correct?

a tennis ball rolling across the court