this post was submitted on 18 Aug 2023
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A, because the portal has the momentum not the people on the tracks?
The people have to exit the portal at the same speed they enter, otherwise they'd have to be squished or something weird.
If 1cm of person enters in 1 second, 1cm of person needs to leave in that second, the only other options are that part of the person disappears or gets compressed to less than 1cm.
Motion is relative though. Both the portal and the people are presumably on earth (or any other planet) and will thus be moving around in space at a fast pace. So the people have momentum, just not relative to the earth (or I guess more specifically not relative to the specific patch of earth they're on).
So there's 2 options: