Momentum is transferred from the trolley to the victims. In order for energy to be conserved, when they accelerate, the trolley will slow down. Now that you think about it it's not that different from being hit by a trolley that has no portal on it
Momentum is transferred from the trolley to the victims. In order for energy to be conserved, when they accelerate, the trolley will slow down. Now that you think about it it's not that different from being hit by a trolley that has no portal on it
A hula hoop would be two portals facing opposite directions. Not the same scenario at all. First portal accelerates the object, second traveling in the opposite direction decelerates it equally resulting in a net zero. If the second portal doesn't move with the opposite direction or speed, then it won't cancel out. The moving portal would have force exerted on it in order to equal out the energy of accelerating the victims
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