A) One
B) Four
C) Two
D) Three
Correct Answer: D
Solution :
u = velocity of bullet \[\frac{dm}{dt}=\]Mass fired per second by the gun \[\frac{dm}{dt}\]= Mass of bullet (mB) × Bullets fired per sec (N) Maximum force that man can exert \[F=u\ \left( \frac{dm}{dt} \right)\] \[\therefore \] \[F=u\times {{m}_{B}}\times N\] Þ \[N=\frac{F}{{{m}_{B}}\times u}=\frac{144}{40\times {{10}^{-3}}\times 1200}=3\]
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