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physics

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A 1.50 103-kg car starts from rest and accelerates uniformly to 18.5 m/s in 11.3 s. Assume that air resistance remains constant at 400 N during this time.
(a) Find the average power developed by the engine.
1 W

(b) Find the instantaneous power output of the engine at t = 11.3 s, just before the car stops accelerating.
2 W

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