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Q.

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 ?

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a

One

b

Four

c

Two

d

Three

answer is D.

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Detailed Solution

F=m(nt)u 

⇒72=20×10−3(nt)1200

⇒nt=3

 

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