Spaceships-special relativity

  • Thread starter SMG75
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Spaceships--special relativity

Homework Statement


Spaceship #1 moves with a velocity of .2c in the positive x direction of reference frame S. Spaceship #2, moving in the same direction with a speed of .6c is 3 x 10^9 m behind. At what times in reference frames S, and in the reference frame of ship #1, will 2 catch up with 1.


Homework Equations





The Attempt at a Solution


I solved for the relative velocity of ship 2 in the IRF of ship 1. I got .7143c. I'm not really sure where to proceed from here. Any ideas?
 

Answers and Replies

  • #2
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The spaceships move in the same direction, so the relative velocity can't be larger than 0.6c. I don't think it's very useful to compute anyway.

Just compute when and where the spaceships catch up in frame S. This can be done in the classical way. Then use the lorentz transform to find the time in the frame of
ship #1
 

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