I'm going to explain this one last time. If you can't understand this, then there is no hope for you, may god have mercy on your soul.
example 1: A ball is moving to the right with velocity v1. For the sake of example we will say 10mph. Portals A and B are stationary. It passes into A at 10mph, and as it enters, it exists B also at 10mph. It continues on at 10mph.
example 2: (I'm not redrawing this so use your imagination) The ball is moving right at 10mph. Both portals are moving LEFT at 5mph. The ball encounters A with a relative velocity of 15mph. It enters A at the relative velocity = 15mph. It exist B at a rate of 15mph. But since B is moving left at 5mph, the ball continues with its initial velocity of 10mph. The ball moves relative to the reference frame at 10mph at all times. BUT it passes through
the portal at 15mph.
example 3: The ball is moving right at 10mph. Both portals are moving RIGHT at 5mph. The ball encounters A and moves through at 10-5=5mph. It emerges from B at the same velocity = 5mph. But since B is moving RIGHT at 5 mph, it continues with its initial speed, equal to the velocity it passed through with (5mph) PLUS the speed of B (5 mph) = 10mph.
In all cases, the ball continues on its course at 10mph. The only difference is how quickly it passes through the portals.
Now that we've established that.
The ball is moving at 10mph. A is moving LEFT at 100 mph. This means the ball enters A at 110mph. The ball will now exit B at 110mph. If B is moving LEFT at 100mph, then it will return to its initial speed of 10mph.
HOWEVER, if B is stationary, then the ball will exit at 110mph, and continue at 110mph.
This is essentially What the question in the OP is asking.
Whatever speed the cube enters A with, is the same speed it must
exit B with, or else be turned into atomic soup.
Thus, the portal A being smashed down on the cube will make it shoot off with the same velocity, simply because the two portals are not moving with the same speed in the same direction.
And this is why Toybox's ring analogies all fail. Because when you slam a ring down onto something, A and B are moving in the same direction with the same speed, meaning you enter and exit with zero change in momentum, hence why things don't fly away when you slam keyrings down around them.
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