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    bubenhofer's Avatar
    bubenhofer Posts: 1, Reputation: 1
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    #1

    Dec 15, 2011, 09:24 PM
    Velocity question
    A marksman at rest fires a 4.00-kg gun that expels a bullet of mass 0.0140 kg with a velocity of 181 m/s. the marksman mass is 81.0 kg. what is the marksmans velocity after firing the gun?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Dec 16, 2011, 07:00 AM
    Are we to assume that the marksman is standing on a frictionless surface (wearing ice skates perhaps)? If so, then conservation of momentum says that the momentum of the marksman + gun going backwards must equal the momentum of the bullet going forwards:



    Solve for V.

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