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T(rule)y Problem
(sopuli.xyz)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
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.