$A$ bullet of mass $40 \,g$ is fired from a gun of mass $10 \,kg$. If the velocity of the bullet is $400 \,m/s$,then the recoil velocity of the gun will be ..........
- A$1.6 \,m/s$ in the direction of the bullet
- B$1.6 \,m/s$ opposite to the direction of the bullet
- C$1.8 \,m/s$ in the direction of the bullet
- D$1.8 \,m/s$ opposite to the direction of the bullet
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