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.
this post was submitted on 18 Aug 2023
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a portal is supposed to be like a hole that you go thru except you end up somewhere else, if i pass a hole over you, would you feel anything? A
Except in that scenario both portals are moving if they act like a moving hole. Imagine a hula hoop, except it's 2 portals connected back to back. If I passed a hula hoop over you, you'd be going into the bottom at the same velocity that you are coming out the top, therefore momentum is preserved. You're moving at the exact same velocity in reference to both of the portals