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Q.

A machine gun is mounted on a 200 kg vehicle on a horizontal smooth road (friction negligible). The gun fires 10 bullets per second with a velocity of 500 m/s. If the mass of each bullet be 10 g, what is the acceleration produced in the vehicle ?

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a

25 cm /s2

b

25 m /s2

c

50 cm /s2

d

50 m /s2

answer is A.

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Detailed Solution

The momentum carried by each ball=m v = 0.010 x 500 = 5 kg m/s∴ Force = change in momentum in one second=5x10=50NSo, acceleration=50200=25cm/s2
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