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A shell of mass 200g is fired by a gun o...

A shell of mass 200g is fired by a gun of mass 100kg. If the muzzle speed of the shell is `80ms^(-1)`, then the recoil speed of the gun is

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m = 0.02 kg , M = 100 kg , v = `80 ms^(-1)` , V = ?
Negative sign indicates that the gun moves in a direction opposite to the direction of motion of the bullet.
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