It's Really About Time: The Science of Time Travel by Ryan John Oliver

Author:Ryan, John Oliver [Ryan, John Oliver]
Language: eng
Format: epub
Publisher: Tahilla Press
Published: 2020-02-03T16:00:00+00:00

From Lauren’s perspective within the carriage, the bullet travels straight downward toward the floor of the carriage and it exits through the hole in the floor. It takes 1/5 of a second to do so (3 meters divided by 15 m/sec.) This is obviously what will happen when the train is stationary and, both from our own experiences of traveling in trains (or other vehicles) and also from the Principle of Relativity, we know that the same thing will happen in a train traveling at constant speed along a straight track. 31

From Liam’s location on the platform, he sees things differently. He also sees the bullet exit the rifle muzzle and disappear through the hole in the floor 1/5 of a second later, just as Lauren did. But in that 1/5 of a second, the train moved to his right a distance of 4 meters (20 m/s times 1/5 of a second). So the actual path of the bullet from his perspective is as shown in Fig. 10(b) and the length of that path is exactly 5 meters. 32 Fig. 10(b) shows four snapshots of the bullet on its way from the rifle’s muzzle to the hole in the floor of the carriage.

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