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Q.

A ball of mass 0.15kg is dropped from a height 10m, strikes the ground and rebounds to the same height. The magnitude of impulse $(k g m / s)$ imparted by the ball is nearly $[g = 9.8 m / s^{2}]$
[Round-off to the nearest integer]

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answer is 4.

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Detailed Solution

$Δ P = m [\sqrt{2 g h_{1}} + \sqrt{2 g h_{2}}]$

$△ P = 0.15 [\sqrt{2 \times 9.8 \times 10} + \sqrt{2 \times 9.8 \times 10}] = 4.2 k g m / s$

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