Help Please - What is the Average Power delivered by a cars engine? (additional info)?

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sempairod727

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A car of mass 1460 kg traveling at 20 m/s is at the foot of a hill that rises 100 m in 3.2 km. At the top of the hill, the speed of the car is 8 m/s. Find the average power delivered by the car's engine, neglecting any frictional losses.

Ive tried two different approaches to this problem and failed.
Help is greatly appreciated.
 
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