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Help with a conservation of momentum problem

  1. Jan 21, 2013 #1
    A 15 g bullet is fired is fired with a velocity of 220 m/s from a 6.5 kg rifle. What is the recoil velocity of the rifle?

    That is the problem

    I think i use the formula......

    This half of the equation equals zero due to the initial velocity equaling zero = Mass of the gun*Velocity of the gun + Mass of the bullet*Velocity of the bullet

    I ended up getting -.22 m/s

    i converted the 15 g to kilograms I was not sure if it should have been grams or kilograms for this problem

    Any help I would be greatful.
  2. jcsd
  3. Jan 21, 2013 #2

    Doc Al

    User Avatar

    Staff: Mentor

    That's good.

    Show how you got that answer.

    Standard units for mass would be kilograms.
  4. Jan 21, 2013 #3
    Alright thanks I thought that was the correct formula, what i was not sure about was the units thanks.
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