The momentum of a bullet of mass 10g fired with a velocity of 80m/s is?
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Momentum is conserved. So the momentum of the gun moving backwards will exactly cancel out the momentum of the bullet moving forward.
The momentum of the bullet is its mass times its velocity: 0.2 kg * 80 m/s = 16 kg-m/s. The momentum of the gun is -16 kg-m/s.
So the velocity of the gun will be its momentum divided by its mass:
v = -16 kg-m/s / 10kg = -1.6 m/s.
Explanation:
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