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Q.

Two balls of equal mass undergo head on collision while each was moving with speed of $8 m / s$ . If the coefficient of restitution is $\frac{1}{2}$ , the speed of each ball after impact will be in $m / \sec$ is-----

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answer is 4.

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Detailed Solution

After impact $V = e u = \frac{1}{2} \times 8 = 4 m / s$

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