A San Francisco cable car loses its brakes and runs away down a hill 30 m high. A) Calculate its speed at the bottom of the hill if there is no friction and its initial speed is zero. B) Suppose instead that the brakes fail only partially and the final speed is observed to be 5 m/s. Calculate the thermal energy generated if the cable car plus its load of passengers has a mass of 8000 kg. Use energy consideration.

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