A 1.50 ✕ 103-kg car starts from rest and accelerates uniformly to 19.9 m/s in 12.7 s. Assume that air resistance remains constant at 400 N during this time. (a) Find the average power developed by the engine.  ___hp (b) Find the instantaneous power output of the engine at t = 12.7 s, just before the car stops accelerating.  ____hp

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