week 5 #9 A model steam engine of 1.00 kg mass pulls eight cars of 1.00 kg mass each. The cars start at rest and reach a velocity of6.40 m/s in a time of 3.00 s while moving a distance of 4.50 m. During that time, the net heat input is 125 J. What is the change in the internal energy of the engine? _____J

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