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Homework Help: Finding velocity using relativistic energy equations

  1. Sep 14, 2009 #1
    Hello all, I was wondering how you take the relativistic kinetic energy equation:

    Total Energy=(gamma)mc^2

    and solve it for a certain velocity.
    In our homework we have to take a high amount of energy that is put on an object with mass initially at rest, and find out what velocity it will have because of the energy.

  2. jcsd
  3. Sep 15, 2009 #2


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    Welcome to PF!

    Hello borie88! Welcome to PF! :wink:

    (try using the X2 tag just above the Reply box :wink:)

    E = mc2/√(1 - v2/c2),

    so just square both sides, fiddle around a bit, and you get v = … ? :smile:
  4. Sep 16, 2009 #3
    Hello borie88
    Are you sure this is the relativistic kinetic energy relation? Is it not so that kinetic energy = (gamma)mc^2-m_0c^2?
    greetings Janm
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