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A gun of mass $1 k g$ fires a bullet of mass $10 g m$ with a Kinetic energy $200 J$ . The velocity of recoil of the gun is

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$1 m s^{- 1}$

$2 m s^{- 1}$

$4 m s^{- 1}$

$3 m s^{- 1}$

answer is B.

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Detailed Solution

$V = \frac{\sqrt{2 m E}}{M}$

$= \frac{\sqrt{2 \times 10 \times 10^{- 3} \times 200}}{1}$

$= 2 m s^{- 1}$

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