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A tension force of 145 N inclined at 25.0° above the horizontal is used to pull...

A tension force of 145 N inclined at 25.0° above the horizontal is used to pull a 39.0 kg shipping crate a distance of 3.60 m on a rough surface. If the crate moves at a constant speed, find (a) the work done by the tension force and (b) the coefficient of kinetic friction between the crate and surface.

i know that a is 473.09 but i cant figure out part b.

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