a book sitting on a shelf a ball rolling down a hill a runner about to start a race a window getting hot from the sun
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which is an example of kinetic energy?
Possibilities:
- a book sitting on a shelf
- a ball rolling down a hill
- a runner about to start a race
- a window getting hot from the sun

a ball rolling down a hill