It depends on "Potential Energy", the amount energy it could have, the amount depending on certain circumstances, like height or force. This was how traditional and some modern rollercoasters work. As the "conveyer belt" pulls you up, the higher you go, the more potential energy you have. Once you are falling down the hill, you are experiencing "Kinetic Energy". Hope it makes sence.
The answer is gravity. I hope this helps.
C. It transfer energy as heat to the surrounding air. This answer is incorrectly
b is the answer there you go if you need the answer
