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Homework Help: Electron positorn collision?

  1. Sep 18, 2010 #1
    1. The problem statement, all variables and given/known data
    Find the total energy produced by an electron positron collision each moving at
    .9c , it is a head on collision.
    3. The attempt at a solution

    Can i just find the relativistic Kinetic energy of one moving at .9c
    and then double it and add it to their rest energies and this would be the total energy .
    Or do i need to do Lorentz transformations to see what velocity the one particle perceives the other .
  2. jcsd
  3. Sep 18, 2010 #2


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    Staff Emeritus
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    Yes. It's usually customary to calculate in either the CM or the lab frame, and in this problem they are one and the same.
  4. Sep 18, 2010 #3
    ok thanks for the help
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