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Q. A body of mass $0.25\, kg$ is projected with muzzle velocity $100 \,m/s$ from a tank of mass $100 \,kg$. What is the recoil velocity of the tank?

AIIMSAIIMS 2012

Solution:

Using law of conservation of momentum, we get
$100 \times v =0.25 \times 100 $
$ v =0.25 \,m / s$