this post was submitted on 14 Nov 2024
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How does relativity work when two Trains move with near Light Speed against each other? (zerobytes.monster)
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The original post: /r/askscience by /u/MrDirtNP on 2024-11-13 20:52:52.

I have three trains (X, Y and Z) of equal proportions on separate parallel tracks in space. Each train is equipped with measurement tools to keep track of the speed, length and direction of the other trains.

Train X stands still while Train Y goes with 50% light speed in one direction while Train Z goes with 50% light speed in the opposite direction. How fast is Train Y relative to Train Z? What would happen when we add even more speed to each train? (Train X is just an anchor point)

Common sense would say 0.5c+0.5c=1.0c but then 0.6c+0.6c=1.2c and that's impossible, is it?

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