What does it mean if the gravitational potential energy of an Earth-apple system is 10 J?
(a) Someone did 10 J of work lifting the apple.
(b) Earth did negative work when someone was lifting the apple.
(c) A 100-g apple is 10 m above the ground.
(d) Parts (a) and (c) are both correct.
(e) We need more information about the coordinate system and the object.
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