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Final velocity of the train at the bottom of the hill

A San Francisco cable car loses its brakes and runs down a hill 45 m high. The mass of the train and its passengers is 7,285kg. The final velocity of the train at the bottom of the hill is 4m/s. How much energy is lost as thermal energy? Write your answer to 3 significant figures

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## Q : Velocity do the balls leave the juggler hands

A juggler's hands are 80 cm apart, and the balls being juggled reach a maximum height of 100 cm above the juggler's hands. (a) at what velocity do the balls leave the juggler's hands?