Warbear wrote:Putting a portal on a surface is equal to putting a hole in a wall.
Q.U. wrote:The problem with A is, that the moment the cube is going through the yellow portal, it appears coming out of the blue one at a certain speed, and since blue portal doesn't start/stop moving, the velocity cannot be simply left, can it? The rate at which the cube will be popping out of the blue portal would be equal to the speed of the yellow one, I'm not sure the cube can then stop moving at that same speed relative to the stationary blue portal. In all fairness, if it was the cube being thrown into the yellow portal at that speed nobody would argue against B, and I think whether it's portal moving or the cube moving, due to interchangeable frames of reference both situations are equivalent.
So if the yellow portal is moving it becomes a moving frame of reference if we choose it in relation to the stationary cube. But then we have to make an assumption that all of the reality along with the blue portal is also the same frame of reference moving with the same velocity. So even if you think the cube has no momentum B would be the correct answer. The cube moving in case B is equivalent to the whole reality (the rest) moving in the opposite direction with the same speed, to compensate for the movement of the yellow portal.
Warbear wrote:This is all irrelevant anyway, because you can't put portals on moving surfaces.
Riz wrote:yes, and I know there's never been an instance where you do that
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