The diagram shows a crate with mass m = 33.1 kg being pushed up an incline that makes an angle φ = 27.8 degrees with horizontal. The pushing force is horizontal, with magnitude P = 570 N. Starting from rest, the crate achieves a speed of 4.99 m/s as it moves a distance d = 7.95 m. 1)What is the work done by friction, in joules?

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