A ball kept at $20 \mathrm{~m}$ height falls freely in downward direction vertically and hits the ground. The coefficient of restitution is $0.4 .$ After the first rebound the upward velocity is $\left[\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^{2}\right]$

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Aicharya · Accepted Answer

$8 \mathrm{~m} / \mathrm{s}$ $h=20 \mathrm{~m}, \mathrm{e}=0.4 \mathrm{~m}$ $	herefore v^{2}=0+2 g h=2 	imes 10 	imes 20$ $	herefore v=2 	imes 10=20$ $e=\frac{\mathrm{u}}{\mathrm{v}}$ $	herefore \mathrm{u}=\mathrm{ev}=0.4 	imes 20=8 \mathrm{~m} / \mathrm{s}$

A ball kept at $20 \mathrm{~m}$ height falls freely in downward direction vertically and hits the ground.…

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