If you walk forward inside a Shinkansen car while the train is moving at top speed, does your personal momentum actually compress the distance between Tokyo and Nagoya, or are you just changing the rate at which the track grid passes beneath your shoes?
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PieFed
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Have a look here, Einstein has you covered: https://www.researchgate.net/figure/Einsteins-famous-train-example-a-When-light-is-emitted-from-two-distinct-points_fig3_270830434
Thank you!