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Solution


Q.

A machine gun of mass 10 kg fires 20 g bullets at the rate of 180 bullets per minute with a speed of 100 ms-1 each. The recoil velocity of the gun is       [2023]
1 0.02 m/s  
2 2.5 m/s  
3 1.5 m/s  
4 0.6 m/s  

Ans.

(4)

20×10-3×18060×100=10 V

⇒v=0.6 m/s