Why is it impossible to observe someone moving faster than the speed of light? Suppose there is a frame A. frame A can observe something moving at the the speed $c/2$ right? So suppose there’s two other frame B,C moving in opposite direction. Both can have a speed of $c/2$ as measured by frame A. It doesn’t contradict any law. But according to frame B, frame A is moving at the speed c/2 and frame C is moving at speed c. What’ll happen then? I’m sure missing something but can’t figure out what.
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1Does this answer your question? Does this count as moving faster than light? – Dale Jul 03 '23 at 16:38