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Homework Help: Velocity after the collision

  1. Nov 16, 2011 #1
    1. The problem statement, all variables and given/known data

    a 480kg car moving at 14.4m/s hits a another car from behind moving at 13.4m/s in the same direction. if the second car has a mass of 570kg and a new speed of 17.9m/s what is the velocity of the first car after the collision??

    2. Relevant equations

    doubt thats it

    3. The attempt at a solution
    i know its 8.94m/s but why??
  2. jcsd
  3. Nov 16, 2011 #2


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    Homework Helper

    You have to use the law of conservation of linear momentum. According to this law, the total momentum before collision is equal to the total momentum after collision..
    So m1u1 + m2u2 = m1v1 + m2v2.
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