A shell of mass \( 0.020 \mathrm{~kg} \) is fired by a gun of mass \( 100 \mathrm{~kg} \). If th...

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A shell of mass \( 0.020 \mathrm{~kg} \) is fired by a gun of mass \( 100 \mathrm{~kg} \). If the muzzle speed of the shell is \( 80 \mathrm{~m} \mathrm{~s}^{-1} \), what is the recoil speed of the gun ?
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