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A 10 g bullet is shot from a 5 kg gun with a velocity of 400 ms^-1. The speed of recoil of the gun is

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0.8 m/s

8 m/s

80 m/s

0.08 m/s

answer is A.

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Detailed Solution

$\begin{array}{l} m = 10 \times 10^{- 3} Kg \\ u = 400 {ms}^{- 1} V = ? \\ M = 5 Kg \\ 5 V = 10 \times 10^{- 3} \times 400 \\ V = \frac{4}{5} \\ V = 0 .8 m / s \end{array}$

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