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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 : How long will it take the object to reach highest elevation

A person throws an object upward with an initial velocity of 20 m/s. Assuming that the object has an initial height of 10m and that g= 9.8 m/s^2. Determine the following: 1.) How long will it take the object to reach the highest elevation?