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2.) A roller coaster runs through its track. At a given moment, the roller coaster train has 50 J of potential energy, 25 J of

2.) A roller coaster runs through its track. At a given moment, the roller coaster train has 50 J of potential energy, 25 J of kinetic energy, and 30 J of internal energy. At this moment, how much mechanical energy does the system have

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