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So, you say, they are moving without speed. Which could only mean when one person touches the portal in one millisecond, his complete body just disappears completely from the rails and in the same millisecond his body appears behind the other portal.
That's not how portals in the game work. That's rather how the transporter in Star Trek works.
Who even said anything about teleporting the whole body?
The portal is moving into him so as the parts of him go through they appear on the other side like a door
Think of it as a portal falling on you and another on the floor next to you, as it falls your head goes through and your head appears through the portal on the ground and the rest of the body goes through as it falls until the portal lands on the floor and you're standing on that same floor but in the other place as the portals are still connected.
Nobody said it's teleporting the whole body. But that was my only explanation of how something can move without speed.
But great, that's what I wanted to clarify the whole time. I think my explanations were too complicated, sorry.
So, taking your example:
When the portal falls on me - as soon as it reaches my neck. Only my head is coming out of the other portal, literally right above the ground. Correct?
As the portal keeps falling down, more and more of my body comes out of the other portal until my whole body is out of it. Correct?
Which leads to the fact that my head was moving from right above the ground to the height of my body. Correct?
So my head moves upwards. And since it takes time for my head to move upwards, we can measure the speed of my head moving upwards. Wouldn't you agree?
Yeah the falling down portal does help a lot with explanation imo
we can measure the speed of my head moving upwards. Wouldn't you agree?
Fair point, we can measure that, it would match the speed of the portal falling. It still won't launch the person as it isn't transferred but you can certainly measure the speed of the portal using it.
But now, when you have a moving object (my body) we need a force to stop that momentum. Where does that force come from?
The force that's keeping you on the ground from the other portal