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A 10G bullet is short from a 5kg gun with a velocity of 400m/s.What is the speed of recoil of the gun?

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  • physics -

    Initial momentum = 0
    momentum of bullet = mv
    momentum of gun = MV

    Using conservation of momentum
    mv+MV = 0
    therefore
    V=-mv/M

  • physics -

    The momenta of the bullet and the gun are equal (and opposite in direction) after firing. If Vr is the recoil velocity,

    5.0*Vr = 0.01 * 400

    Solve for Vr, which will be im m/s.

    Note that I had to use the same mass units for bullet and gun.

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