A 1.50 10³-kg car starts from rest and accelerates uniformly to 16.7 m/s in 11.4 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 = 11.4 s, just before the car stops accelerating. (hp)