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You accidently bump into a bokcase. It t...

You accidently bump into a bokcase. It tils briefly but then returns to upright, and you breathe a sigh of relief. When you first bumped the brookcase, its center of gravity moved.

A

Upward and its gravitational potential energy increased.

B

downward and its gravitational potential energy decreased.

C

downward and its gravitational potential energy increased.

D

upward and its gravitational potential energy decreased.

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The correct Answer is:
A
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