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Q.

A heavy steel ball of mass greater than 1 kg moving with a speed of 2 m sec-1 collides head on with a stationary ping-pong ball of mass less than 0.1 gm. The collision is elastic. After the collision the ping-pong ball moves approximately with speed

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a

2msec−1

b

4msec−1

c

2×104msec−1

d

2×103msec−1

answer is B.

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Detailed Solution

We know that when heavier body strikes elastically with a lighter body then after collision lighter body will move with double velocity that of heavier body. i.e.the ping pong ball move with speed of  2×2=4m/s
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