>>51736659>answer in 6 secondsLay off the caffeine, bro.
But she's not right. Looking into the blue portal, from that frame of reference, the whole world is flying at you at tremendous speed and so the cube will keep moving at that velocity as well. Relativity isn't easy to intuitively grasp, but it's B. Portals are just ridiculous.
>>51736798It's not a door. Look into the blue portal and you see the entirety of the world moving at you with speed. From that frame of reference, it's as if someone comes running through the door.