For each pair; which has higher kinetic energy?
(a) a sled resting at the top of a hill or a sled sliding down the hill
(b) water above a dam or water falling over the dam

(a) A sled sliding down a hill has more kinetic than a sled resting at the top of the hill

(b) water falling over the dam has more kinetic than water above a dam

Explanation:

Kinetic energy is a type of energy that is related to the movement of bodies. The result of kinetic energy is intrinsically linked to the mass value of the object and its velocity of movement.

In short, kinetic energy is generated through movement. For this reason, we can prove that a sled down a hill has more kinetics than a sled resting on the top of the hill just as the water falling on the dam has more kinetics than the water above the dam.

c is the answer because when something is left after something evaporates that shows the chemical change.