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Elastic Collision Problem. Help!

  1. Dec 16, 2008 #1
    1. The problem statement, all variables and given/known data
    2 objects A & B rolling along a frictionless horizontal surface. object A of mass 1 kg is initially moving to the left @ 2 m/s while object B of mass 0.5 kg moves to the right @ 1 m/s. What is the velocity of each object after the collision if the collision is elastic?


    2. Relevant equations

    [m][/A][v][/A]+[m][/B][V]=[m][/A][v][/A]'+[m][V]'[SUBm][/SUB1]

    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Dec 16, 2008 #2

    rl.bhat

    User Avatar
    Homework Helper

    Apply the law of conservation of momentum and law of conservation of energy. Take care that the two initial velocities are not in the same direction.
     
  4. Dec 16, 2008 #3
    Since there is no net external force on the system, the momentum is conserved... and since it's also a elastic collision energy is also conserved.

    The easiest way to go about this problem is to use conservation of linear momentum
    [​IMG]

    another way of going about this is that since energy is also conserved.
    [​IMG]

    Let me know how it goes...
     
  5. Jan 1, 2009 #4
    Re: Collision Problem. Help!

    hey, thanks guys. Got the answer. phew..!:smile:
     
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