a person is riding on u-shaped ramp. at which point does the person have the greatest potential energy?
A. on the other side of the ramp as the person is coming back up the ramp
B. at the top of the ramp before they begin moving down into the ramp
C. on the first part of the ramp as the person is moving down the slide
D. in the middle of the ramp at its lowest point in the U