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Conservation of Momentum of a shot bullet

  1. Oct 10, 2012 #1
    1. The problem statement, all variables and given/known data
    If a 30 g bullet is shot with a velocity of +300 m/s from a 7.5 kg gun, what is the recoil velocity of the gun?

    m1 = 0.03 kg
    v1 = 300 m/s
    m2 = 7.5 kg

    Velocity initial for both objects is 0.0 m/s

    2. Relevant equations

    (m1 + m2)(v) = (m1v1) + (m2v2)


    3. The attempt at a solution

    0 = (0.03kg x 300m/s) + (7.5kg x v)
    0 = 9kgm/s = (7.5kg x v)
    -9kgm/s = 7.5 kg x v
    v = -1.2 m/s
     
  2. jcsd
  3. Oct 10, 2012 #2
    Your attempt and solution look good.
     
  4. Oct 10, 2012 #3
    Okay :) Thank you!
     
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