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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 : Calculate the irons temperature change

Suppose a 30 gram piece of iron is dropped into a container of water and gives off 165 calories in cooling. Calculate the iron's temperature change.