A sleigh and driver with a total mass of 120 kg are pulled up a hill with a incline by a horse, as illustrated in Fig. 5.36.
(a) If the overall retarding frictional force is 950 N and the sled moves up the hill with a constant velocity of 5.0 km/h, what is the power output of the horse? (Express in horsepower, of course. Note the magnitude of your answer, and explain.)
(b) Suppose that in a spurt of energy, the horse accelerates the sled uniformly from 5.0 km/h to 20 km/h in 5.0 s. What is the horse’s maximum instantaneous power output? Assume the same force of friction.

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