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Which Equation is right?

  1. Mar 13, 2010 #1
    Hi,

    I know that,

    E1 = E0 + EK, and
    E2 = (mc2)2 + (pc)2 = E02 + EK2, but
    E0 + EK ≠ (E02 + EK2)1/2

    Is one of them wrong?
    Why the pythagoras theorem is used in the second equation?

    Thanks.
     
  2. jcsd
  3. Mar 13, 2010 #2

    DrGreg

    User Avatar
    Science Advisor
    Gold Member

    Correct

    Incorrect

    E2 = E02 + 2 E0EK + EK2
     
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