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Momentum in special relativity

  1. Feb 10, 2013 #1
    1. The problem statement, all variables and given/known data
    Hi there.

    I added a question as an image, what is the right way to find the momentum?

    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Feb 10, 2013 #2

    Simon Bridge

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    You use the energy-momentum relationship.

    ##E^2 = m^2c^4 + p^2c^2##

    The kinetc energy is ##K=(\gamma -1)mc^2## and ##E=\gamma mc^2##
     
  4. Feb 10, 2013 #3
    Im aware of that. However could you please address the question in the picture? Which way is wrong, and why?
     
  5. Feb 11, 2013 #4

    Simon Bridge

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    I was[/] addressing the pic.
    The pic includes the question "What is the momentum of the moving particle?"
    You wanted to know the right way to go about it - I told you.

    It seems I misunderstood.
    Define "right way". (What makes you think there is a wrong way in there?)
    The pic shows you how to solve for two contexts in relation to the center-of-mass.
     
    Last edited: Feb 11, 2013
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