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Jan 17, 2022 at 22:55 comment added Gumby The Green But since the boxcar is moving, 1) it has length contraction, which causes A to reflect before B and 2) even if they did reflect "at exactly the same moment" on the boxcar, it wouldn't be the same moment on the ground due to the relativity of simultaneity.
Apr 20, 2017 at 7:00 review Late answers
Apr 20, 2017 at 7:27
Apr 20, 2017 at 6:41 history answered user46187 CC BY-SA 3.0