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17 May, 15:13

A tennis ball bounces on the floor three times, and each time it loses 23.0% of its energy due to heating. how high does it bounce after the third time, if we released it 4.0 m from the floor?

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  1. 17 May, 16:47
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    1.8 meters Since the ball loses 23.0% of it's energy with each bounce, that means that it retains 100% - 23.0% = 77.0% of it's energy per bounce. And since it bounces 3 times, that means that it will have 0.77^3 = 0.456533 = 45.6533% of it's original energy after the third bounce. So it will reach 45.6533% of it's original height after the third bounce. So 45.6533% * 4.0 = 0.456533 * 4.0 m = 1.8 m
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