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A 500-kg dragster accelerates from rest to a final speed of 110 m/s in 400 m...

A 500-kg dragster accelerates from rest to a final speed of 110 m/s in 400 m (about a quarter of a mile) and encounters an average frictional force of 1200 N. What is its average power output in watts and horsepower if this takes 7.30 s?

In this question, the answer will lead to Energy=KE final+ W friction
How is it + while friction will go to the oppisite side of the path the dragster goes? Or is that an equation I don't know???
Thanks
Science   Advanced-Physics   
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