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I need HELP !

  1. Apr 7, 2010 #1
    A ball of mass 0.198 kg has a velocity of 1.47 i m/s; a ball of mass 0.309 kg has a velocity of -0.401 i m/s.They meet in a head-on elastic collision.

    a) Find their velocities after the collision

    b) Find the velocity of their center of mass before and after collision
  2. jcsd
  3. Apr 7, 2010 #2
    Since it's an ellastic collision, momentum is conserved. a) can be found with conservation of momentum.
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