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Question

A bullet of mass 60 g is fired with a velocity of 60 m/s from a gun of mass 10 kg. Calculate the recoil velocity of the gun.

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Solution

As no external force is acting on the bullet-gun system, the momentum of the system will remain conserved.
Let m1= Mass of the bullet = 60 g = 0.06 kg
m2= Mass of the gun = 10 kg
v1 = Velocity of the bullet = 60 m/s
v2 = Recoil velocity of the gun
Applying the conservation of momentum, m1v1=m2v2
0.06×60=10×v2
v2=0.36 m/s

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