A, the people are traveling towards the portal, not the other way around.
If they were falling/running at the portal it would be different.
Here the portal is moving forward towards them, they have no momentum.tk travel through the portal.
this post was submitted on 18 Aug 2023
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The only way it could be B in this universe is if the train also decelerates equivalent to how the people accelerate. If the people accelerate and the train maintains velocity you've created energy in a closed system.
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I've seen this debate about the outcome of the moving portal. I'm pretty certain that because of inertia, and the people aren't moving, they will just plop out the other side. Think of it like moving a hoola hoop through the people. That's basically what the portal is.
The hoola hoop has inertia and is moving, but it doesn't actually come in contact with the people, so it passes right around them. There's no way for the people to have instant acceleration because the porta did, otherwise it'd be like them hitting a brick wall and they would probably explode
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Someone take this a step further and make the train an airplane on a treadmill
My original idea for this involved two tracks (like the original trolley problem) and which track you chose (for minimum casualties) would depend on your interpretation of the physics problem.
Unfortunately it ended up super complicated and I made this simple one instead.
But adding the train on a treadmill is a great way to overcomplicate it further if I ever go for the complicated version.
The Portal can't move front or back, only "to it's sides"