>>11566122That's probably going to be violated one way or another. From the perspective of the blue portal, the cube was already moving. If it were to suddenly stop moving upon making it all the way through, as with scenario A, what force acted upon it to make it stop?
The only way to preserve "no motion" on both ends would be to have the entire cube compressed into an infinitely dense 2D hologram on the edge of the blue portal.
Which then turns into the question of how does an infinitely compressed object behave? Does it instantly create a black hole? Does it give rise to an opposite force equivalent to the "compression", causing there to be resistance to the cube going through the orange portal in the first place? If the "decompression" force was equal in both directions perpendicular to both portal faces, the top half of the cube would want to decompress away from the blue portal, while the stationary cube on the orange side would be pushed into the platform where it would be met with the normal force, eventually causing the whole cube to fly out of the blue portal, propelled by the ricochet of the cube "bouncing" off of the platform due to a "hole" somehow exerting a normal force on it, with the total opposite action being pushing the entire earth downward a bit?
The result is still something more like B than A.
