The things that determine the amount of an object's gravitational potential energy are ...
-- mass of the object
-- gravitational acceleration in the place where the object is
-- height of the object above the ground or the floor
A). a slice of bread; No. It's still a slice of bread even if it's on the ground.
B. A compressed spring; No. It's still a compressed spring even if it's on the ground.
C. An apple on a tree; Yes ! It can't be an apple on a tree if it's on the ground.
D. A stretched bow string; No. It's still a stretched bowstring even if it's on the ground.
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Explanation:
