this post was submitted on 18 Aug 2023
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[–] whileloop@lemmy.world 5 points 1 year ago (1 children)

All motion is relative. To understand how the people will move, we need to look at them relative to the portal. If the trolly is moving at 5 m/s relative to the ground, then the people are moving at 1 m/s relative to it. So they enter the portal moving at 1 m/s and exit at the same speed.