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Classical Mechanics

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The Net Change of Gravitational Potential Energy

CLMECH-ZEGHKQ

Ignore friction in the following situations and rank the net changes of the gravitational potential energy (lowest first).

I. When a 0.15-kg apple falls from a tree branch to a level ground 2.0 m below, it bounces 3 times and then stops.

II. A person tosses a 0.60-kg ball at $30^o$ from a height of 1.0 m and the ball lands and comes to rest on a 0.50-m high leaf pile.

III. A girl leans from a window and tosses a set of 0.10-kg keys from a height of 4.0 m to a friend leaning from a window above and who catches the keys at the height of 7.0 m.

A

I and II tie, then III

B

I, II, III

C

II, I, III

D

All tie

E

I, then II and III tie

F

III, then I and II tie