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A ball falls from a height of 20m on to a horizontal plane. If the coefficient of restitution is 0.6 the height to which it rebounds after 3 collisions is approximately

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0.94 m

0.47 m

0.3 m

0.6 m

answer is A.

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Detailed Solution

$h_{h} = e^{2 n} h = {(0.6)}^{2 \times 3} \times 20 = 0.94$

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