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Physics Lab 3: Momentum

The third in my series of puzzles inspired by real physics.

Momentum is related to mass and velocity and is conserved during a collision (except when friction gets invovled, greatly complicating things, which is why physics professors accross the world use the phrase "ignoring friction" on a regular basis). When two objects collide, momentum is transferred between them but the total momentum stays the same.

I've modded my PTI editor so that there is now a placement helper above the faith plate. This greatly reduces the chance that the cube will hit the edge of the portal on its way through.