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Solution


Q.

An average force of 125 N is applied on a machine gun firing bullets each of mass 10 g at the speed of 250 m/s to keep it in position. The number of bullets fired per second by the machine gun is                  [2023]
1 5  
2 50  
3 100  
4 25  

Ans.

(2)

F=nmv

where n=number of bullets fired per second

      n=Fmv=12510×10-3×250=50