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Question

A bullet of mass 0.01 kg is fired from a gun of mass 5 kg with velocity of 250 m/s, calculate the speed with which the gun recoils.


A
0.50 m/s
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B
0.25 m/s
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C
0.05 m/s
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D
0.025 m/s
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Solution

The correct option is C 0.50 m/s
As the net external force on the gun bullet system is zero, the sum of the momentum of the gun and bullet system will be constant.
Now as the gun+bullet system was initially at rest, the initial momentum of the system =-0.
Hence, according to the law of conservation of momentum,
(the final momentum of the bullet fired) + (final momentum of the gun that recoils (opposite direction)) =0
Momentum of the bullet =(0.01)×250=2.5 kgm/s
Let v be the velocity of the recoil of the gun.
Momentum of the recoiling gun =(5)×v=5v kgm/s
Equating we have 2.5+5v=0
v=0.5 m/s
The speed with which the gun recoils is 0.50 m/s in the opposite direction of speed of bullet.

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