1300 kg elevator car carries passengers with combined mass of 520 kg. It is ascending at a constant speed powered by a motor that provides 45.0 hp to the elevator. A constant frictional force of 5000 N retards its motion. (a) How high could the elevator ascend in 10.0 s? (b) If the elevator instead accelerates from rest and ascends the same distance over the same time duration, what power (in hp) must the motor deliver at the instant it reaches the same height?

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