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Q.

A gun is mounted on a vehicle which is at rest on a frictionless road. Mass of vehicle + gun is 1600 kg. The gun fires 20 bullets per sec, each with a velocity 400 m/s. Mass of each bullet is 20 gm. Acceleration produced in the vehicle is:

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a

12 cm/s2

b

14 cm/s2

c

8cm/s2

d

10 cm/s2

answer is D.

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Detailed Solution

Acceleration produced =vdm/dtm=(400)20×10−3(20)1600=0.1m/s2
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