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Q.

A ball of mass m approaches a wall of mass M (>>m) with speed 4 m/s along the normal to the wall. The speed of wall is 1 m/s towards the ball. The speed of the ball after an elastic collision with the wall is

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a

5 m/s away from the wall

b

9 m/s away from the wall

c

3 m/s away from the wall

d

6 m/s away from the wall

answer is D.

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Detailed Solution

V1=m1−m2u1m1+m2+2m2u2m1+m2V1=(m−M)(4)(m+M)+2×M(−1)(M+m)m<
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