246. assignment (internal energy)
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 of 5.00 m/s in a time of 5.00 s while moving a distance of 5.30 m. During that time the engine takes in 135 J of heat. What is the change in the internal energy of the engine? _____J
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