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To make it clear from the start: I agree 100% with B - there has to be movement, because without it, people wouldn't come out of the portal at all. And if there is a movement, then the only reasonable speed would be that of the train.
But: Your question about the energy is still interesting. It must come from somewhere. And I think, the only source, from which it can come, is the train. That is, the train would lose energy and therefore slow down.
The portal moves towards the people. It's a hole. Momentum won't transfer from nothing as the hole is the one moving.
So, how would the people come out of the portal without movement?
Because the portal is moving them through it
Like how you would move through a hoop if it passed through you, it's just a door through space
Do we agree that the massive block with the blue portal is not moving? So, imagine we are standing right in front of it when it happens - what happens exactly? How do the people appear?
Yes the blue portal isn't moving
The people appear because the orange portal is moving towards them, the people then, like through a moving door, just pop out the other side.
It's a door way through space, not a momentum giving portal.
Can you not see the orange portal moving? They don't jump through it, this carrying their own momentum through. They are stationary through it so coming out they will also be stationary
Of course I see the orange portal moving. So we agree the orange portal is moving, the blue is stationary.
So, when you're saying "the people just pop out the other side". What does that mean? Do they pop out one by one? So one moment, no one is there, the next moment one person spawns and after that the third person spawns? Or do they spawn altogether? Or does each person come from the portal centimeter by centimeter, atom by atom - pushing through the portal?
It's on a slant so they will just fall down and yes on top of each other one by one
That's not what I mean. Let's just look at one person: the person will not just appear as a whole at the blue portal, right? First there will be, I don't know, the left arm, then the left side of the torso, the middle part... and so on. That's what I meant with centimeter by centimeter, atom by atom - pushing through the portal. Would you agree?
At least that's how it's in the game. It's not that you are touching one portal, despawn and appear at the other portal, right?
Yeah they kinda lose ground under them as the portal goes through them, they aren't pushed, they are moved through space. No additional force or momentum is ever applied.
In the game you aren't pushed through ever, you walk through or fall through them. You appear at the other side of the door.