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Rifle recoil speed homework

  1. Apr 30, 2009 #1
    1. The problem statement, all variables and given/known data

    A rifle has amass of 4.5 kg and it fires a bullet of mass 10 g at a muzzle spped of 820m/s what is the final recoil speed of the rifle as the bullet leaves the gun barrel?

    2. Relevant equations

    conservation laws

    3. The attempt at a solution
    4.5v=1000*820
    v=1.8*10^5
     
  2. jcsd
  3. Apr 30, 2009 #2
    Re: Problem

    What? 0.0 The mass of the bullet is 10 grams, not 1000 kg. =D

    Be consistent with your units, but your method is sound, I suggest converting your grams in kilograms.
     
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