A shell of mass $0.020\; kg$ is fired by a gun of mass $100\; kg$. If the muzzle speed of the shell is $80 \;m s^{-1}$, what is the recoil speed in $m/s$ of the gun ?

  • A

    $0.8$

  • B

    $0.08$

  • C

    $0.016$

  • D

    $0.16$

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