Question 10 / 10 Students are investigating changes from potential to kinetic energy by rolling a marble down a ramp
made by propping up a plastic ruler on a book and letting it roll down (see picture). Which of the following will change the
potential energy the marble starts with?
A. Switching the plastic ruler with a wooden one,
B. Adding more books beneath the ruler.
C. Pushing the marble down the ramp.
D. Replace the marble with a rock