Q.

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

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a

1000 N

b

1200 N

c

800 N

d

2400N

answer is D.

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Detailed Solution

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Given thatnt=20,m=150g=150×10-3 kg v=800m/s,u=0,F=? F=nmvt =20×150×10-3×800=2400N F=2400N

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