A 15 kg bullet is fired with a velocity of 200 m/s from a 6 kg rifle. what is the recoil velocity of the rifle?
Answer: Use conservation of momentum:
mv = mv
(0.015kg)(200m/s)=(6kg)(v)
v = 0.5 m/s opposite the bullet
The direction is determined from Newton's Third Law: every action has an equal and opposite reaction.
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