# Recoil velocity of a rifle?

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a 7g bullet is fired horizontally at 300m/s from a 1.5kg rifle. what is the recoil velocity of the rifle if the momentum is conserved
asked Mar 2, 2014 in Others

## 1 Answer

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Momentum is conserved: $$P_i=P_f$$  $$0=m_bV_b+M_rV_r$$

May define the positive direction as the direction that the bullet travels. So $V_b=300m/s$ and $V_f$ will be negative.
answered Mar 20, 2014 by (21,750 points)