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Q.

A machine gun fires a bullet of mass $20 g$ with a velocity $1200 m s^{- 1}$ . The man holding it, can exert a maximum force of $72 N$ on the gun. How many bullets can he fire per second at the most ?

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a

One

b

Four

c

Two

d

Three

answer is D.

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Detailed Solution

$F = m (\frac{n}{t}) u$

$\Rightarrow 72 = 20 \times 10^{- 3} (\frac{n}{t}) 1200$

$\Rightarrow \frac{n}{t} = 3$

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A machine gun fires a bullet of mass 20g with a velocity 1200ms−1 . The man holding it, can exert a maximum force of 72N on the gun. How many bullets can he fire per second at the most ?