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16 October, 17:25

A 1.00-kilogram ball is dropped from the top of a building. just before striking the ground, the ball's speed is 12.0 meters per second. what was the ball's gravitational potential energy, relative to the ground, at the instant it was dropped? [neglect friction.]

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  1. 16 October, 18:07
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    During the fall, the potential energy stored in the ball is converted into kinetic energy.

    Thus,

    PE = KE before hitting the ground

    = 1/2 • mv^2

    = 1/2 • 1 • 12^2

    = 72J
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