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A 150kg cart moving at 13m/s east collided with a 420kg wagon

  1. Nov 24, 2011 #1
    1. The problem statement, all variables and given/known data
    A 150kg cart moving at 13m/s east collided with a 420kg wagon moving at 5m/s east.The cart rebounded westward with a speed of 3m/s. What was the speed of the wagon after the collision?


    2. Relevant equations

    m1v1+m2v2=m'1v'1+m'2v'2


    3. The attempt at a solution
    I solved the problem with this formula but i got 8.57m/s as the answer but the correct answer should be 11m/s.
     
  2. jcsd
  3. Nov 24, 2011 #2
    Re: Collisions

    Watch your signs(+/-)
     
  4. Nov 24, 2011 #3
    Re: Collisions

    thanks!!
     
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