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PHYSICS: Conservative Forces and Potential Energy

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A mass m = 18 kg is pulled along a horizontal floor with NO friction for a distance d =6.6 m. Then the mass is pulled up an incline that makes an angle θ = 38° with the horizontal and has a coefficient of kinetic friction μk = 0.44. The entire time the massless rope used to pull the block is pulled parallel to the incline at an angle of θ = 38° (thus on the incline it is parallel to the surface) and has a tension T =70 N.

What is the work done by friction after the block has traveled a distance x = 1.6 m up the incline?

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