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Question

A machine gun fires a bullet of mass 40 g with a velocity 1200 ms1. The man holding it can exert a maximum force of 144 N on the gun. How many bullets can the man fire per second at the most?

A
One
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B
Four
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C
Two
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D
Three
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Solution

The correct option is C Three
Let n be the maximum no. of bullets fired by man per sec.
Force = rate of change of momentum
F=nmΔV
144=n×401000×1200
n=3

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