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Question

A heavy steel ball of mass greater than 1 kg moving with a speed of 2 m sec−1collides 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


A

2m sec1

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B

4m sec1

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C

2×104m sec1

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D

2×103m sec1

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Solution

The correct option is B

4m sec1


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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