>>720083798
>>720085441
>>Momentum, a function of mass and velocity, is conserved between portals. In layman's terms, speedy thing goes in, speedy thing comes out
There is no momentum. It's a stationary box.

Hey everybody, want to see something funny? Watch these two fags dance around and refuse to answer this question: Where is the energy that supposedly moves the box coming from? Reminder that relativity is not a form of energy.