because of that law it is B ;). the cube “teleports” into the reference frame of after the portal and in this frame it is highly in motion.
it’s like you trying to jump on to a moving train, you first need to match the trains velocity (speaking relative to earth), then you are at rest in the trains frame.
this kind of thoughts is what makes special relativity so cumbersome.
It would probably be A because of Newton’s first law of motion.
because of that law it is B ;). the cube “teleports” into the reference frame of after the portal and in this frame it is highly in motion.
it’s like you trying to jump on to a moving train, you first need to match the trains velocity (speaking relative to earth), then you are at rest in the trains frame.
this kind of thoughts is what makes special relativity so cumbersome.