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Jun19-11, 09:03 PM
Sci Advisor
PF Gold
Fredrik's Avatar
P: 9,506
I'm not going to spend a lot of time on finding a solution that doesn't require you to understand relativity of simultaneity first. Maybe there is one, maybe there isn't. What's important here is what SR says about this situation. The Lorentz transformation is a part of the definition of SR, and the addition of velocities formula follow easily from that, so "what SR says" is precisely what you get from that formula.