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Homework Help: Non-parallel velocity addition

  1. Feb 9, 2013 #1
    1. The problem statement, all variables and given/known data
    A spaceship moves with a velocity 0.75c xhat with respect to the earth. The ship releases a probe with a velocity 0.75c yhat relative to the ship. What is the velocity of the probe as viewed on earth, magnitude and direction?

    2. Relevant equations
    The velocity-addition formulae for all three spacial directions

    3. The attempt at a solution
    I think that the velocity observed in the x direction of the probe will just be 0.75c, but im having trouble wrapping my head around finding the velocity in the other directions. I know the velocity is changed due to the time dilation but cannot find the necessary equations to use. I think we are supposed to use 4-vectors
  2. jcsd
  3. Feb 9, 2013 #2


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