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a bullet of mass 30 g. is fired from a pistol of 2.1kg at a velocity of 300 m/s calculate the recoil velocity of the pistol

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    Total momentum remains zero.
    The recoil momentum of the gun therefore equals the forward momentum of the bullet.

    Vbullet*0.030 kg = Vrecoil*2.1kg

    Vrecoil = (0.030/2.1)*300 m/s = 4.3 m/s

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