A heavy steel ball of mass greater than 1 kg moving with a speed of 2 $m / s$ 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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$20, 000 m / s$

$2 m / s$

$4 m / s$

$2, 000 m / s$

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 $2 \times 2 = 4 m / s$

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