Quote Originally Posted by MadMojoMonkey View Post
I can't believe people would answer that physics-violating portals would behave in a way that violates physics.

Some people just lack common sense.
I see no evidence that this portal defies the laws of physics.

The known laws, maybe. But that's not the same thing.

Anyway, the correct answer is A and oskar must be pretty dumb to think it's B. Imagine an open door moving towards you really fast. So long as you're stood in the right place (it's questionable if these folk on the train tracks are positioned correctly but let's assume so) then you'll be absolutely fine and there will be no transfer of energy. Your motion after going through the portal will be the same as your motion before you went through it, because of inertia.