this post was submitted on 18 Aug 2023
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Lets say the train is moving with 10 meters per second. That means that the people will enter the portal with 10 meters per second. Therefore, they will leave the other portal with, you guessed it, 10 meters per second. Henceforth, they will be traveling with 10 meters per second after leaving the portal. 10 meters per second.
How many meters per second was that again?
If the other portal is on back of the train, they they will stay at rest(might be displaced to back at lengthOfTheTrain distance
Like that episode of myth busters where they fired a canon backwards out of a moving vehicle
Where will the energy that accelerates the people come from?
The train.
As the object enters the first portal then the inertia of the far end of the object that is forced to pass through will need to be accelerated in the space outside the second portal to pass through, acceleration which is induced by being pushed by the other end of the object still outside the first portal.
In other words, pushing a portal onto an object pushes that object with half the speed of the portal. This will likely require energy put into the portal itself to maintain it, which needs to come from the train.
That was an idea I'd floated above as well.
The train never touches the people.
The portal touches them first, moving where the people are.
The portal is moved by the train
The would be moving at 10 meters per second in regards to the train that didn't touch them, the same as the were before the train got close enough to touch them.
Think of it the other way. If the went into the stable portal and came out I'm from of a moving portal, what would happen?
The portal would move forward and swallow them up and spit them back out the way they came in.
They would not have accelerated in the process. They wouldn't fly out the portal they just walked in at the speed of the train. The train didn't touch them so it can't transmit any of its momentum to them.