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Homework Help: Velocites in Different Reference Frames

  1. Apr 11, 2012 #1
    1. The problem statement, all variables and given/known data

    The Millenia is catching up to the Galaxa at a rate of 0.55c when the captian of the Millenia decides its time to fire a missle. He uses a laser range finder to determine the distance to Galaxa and then he fires a missle that is moving at a speed of 0.45c.

    What speed does the Galaxa measure for a) the laser beam and b) the missle as they both approch the starship

    2. Relevant equations

    I belive i would be using the relativistic velocity transformation formula for this problem however I dont understand how it works.

    v= V1+V2/(1+ V1V2/c^2)

    Would i do the equation and solve for a value for the laser beam and then use that to find the value for the missle?

    3. The attempt at a solution

    I tried using the known values for V1 and V2 but i got an answer of 1 and i dont know if that makes sense.

    Thank you In advance for any help :)
  2. jcsd
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