A 16.6 kg block is dragged over a rough, hor- izontal surface by a constant force of 86.7 N acting at an angle of 33.7◦ above the horizon- tal. The block is displaced 38.9 m, and the coefficient of kinetic friction is 0.123. Find the work done by the 86.7 N force. The acceleration of gravity is 9.8 m/s2 . Answer in units of J.

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