A machine gun fires 20 bullets per second into a target. Each bullet weighs 150 g and has a speed of $800 m s^{- 1}$ .The force necessary to hold the gun is

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1000 N

1200 N

800 N

2400N

answer is D.

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Detailed Solution

Given that $\frac{n}{t} = 20, m = 150 g = 150 \times 10^{- 3} k g v = 800 m / s, u = 0, F = ? F = \frac{n m v}{t} = 20 \times 150 \times 10^{- 3} \times 800 = 2400 N ∴ F = 2400 N$

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