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How does the accelerated object know that its relative speed has not altered?
the train supplies the extra energy to bring the car to 120mph
Whichever way around, conservation of energy applies. You can't, and don't get something for nothing.
WolfekeeperQuote from: Colin2B on 12/12/2015 16:17:28Whichever way around, conservation of energy applies. You can't, and don't get something for nothing.This is the very essence of the question. As there is no way to recover the kinetic energy from the car, it must stay with the car.
the car is accelerating ON TOP OF the train, it's tyres are pushing the car in one direction, and the train in the other.