1.

A machine guns 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 fire per second at the most. (1) Three(2) Four(3) Two(4) One 

Answer»

Answer is (1) Three

F = dp/dt = mνn 

n = F/mν = 144/(0.04 x 1200) = 3 



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