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How einstein proved equation about speed

  1. Oct 4, 2013 #1
    How einstein proved that equation: U=(V1+V2)/(1+(V1*V2)/c^2) ?
    Thanks !!!
  2. jcsd
  3. Oct 4, 2013 #2


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  4. Oct 5, 2013 #3
    As I see Lorentz helped a lot to this equations.
    How lorenz proved them?
  5. Oct 5, 2013 #4

    Vanadium 50

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    What did you not understand about the answer you got?
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