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13 July, 15:01

A 20.0 kg object is at rest, and then speeds up to 16.0 m/s. How much work was done on this system? 320 J 2,560 J 2,880 J 5,120 J

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  1. 13 July, 15:44
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    The initial kinetic energy is 0. The final kinetic energy is the amount of work done: (1/2) m·v² = (1/2) (20 kg) (16 m/s) ² = 2,560 kg·m/s² = 2,560 J
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