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Q.

A machine gun fires a bullet of mass 40 g with a velocity 1200 ms-1.The man holding it can exert a maximum force of 144 N on the gun. How many bullets can be fired per second at the most?

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a

Only one

b

Three

c

Can fire any number of bullets

d

144 x 48

answer is B.

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Detailed Solution

Given,  mb=40 g,vb=1200 ms-1F = 144 N∴ F=nma=mbνbt×n⇒  144=40×12001000×n⇒n=3
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A machine gun fires a bullet of mass 40 g with a velocity 1200 ms-1.The man holding it can exert a maximum force of 144 N on the gun. How many bullets can be fired per second at the most?