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10 February, 05:44

A ball with a mass of 0.5 kilograms is lifted to a height of 2.0 meters and dropped. It bounces back to a height of 1.8 meters. The energy of the ball has been reduced by joules after bouncing back. This reduction happens because potential energy transforms to energy. Hint: Use PE = m * g * h where g = 9.8 m/s2. NextReset

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  1. 10 February, 06:16
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    The difference in height is 2.0-1.8=0.2m. The gravitational energy lost is 0.5*9.8*0.2=0.98 joules.
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