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Q.

A meal plate of mass 500 g is balanced in mid air by throwing 20 balls per sec, each of mass 5 g vertically up from below, which gets rebounced with the same speed.  Find the velocity with which the balls strike the plate (g = 9.8 m/sec2)

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a

24.5 m/sec

b

23.5 m/sec

c

22.5 m/sec

d

27.5 m/sec

answer is A.

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Detailed Solution

Mg=N(2mu)0.5×9.8=20×2×5×10−3×uu=4.90.2=24.5ms−1
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