A 1500 kg car coasts in neutral down a 2.0 hill. The car attains a terminal speed

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A 1500 kg car coasts in neutral down a 2.0° hill. The car attains a terminal speed of 20.0 m/s. 

(a) How much power must the engine deliver to drive the car on a level road at 20.0 m/s? 

(b) If the maximum useful power that can be delivered by the engine is 40.0 kW, what is the steepest hill the car can climb at 20.0 m/s?

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