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Homework Help: Elastic collision

  1. Feb 28, 2005 #1
    A proton, moving with a velocity of v1i collides elastically with another proton that is initially at rest. One proton has three times the speed of the other after the collision. How would I find the speed of each proton after the collision in terms of vi and their velocity vectors after the collision?

    I understand that momentum is conserved, but i see how to apply it.

    Any help would greatly be appreciated.
  2. jcsd
  3. Feb 28, 2005 #2


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    Well,then yes,u must use both momentum conservation (in vector form !) and conservation of KE (since u don't have the #-s you can assume for simplicity non-relativistic case)...

    That would be all.Just choose 2 orthonormal axis and simple algebra to find what u want.

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