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Is this right?

A ramp has an incline angle of 25 degress. How much work must you do if you are to drag a 50 kg mass a distance of 100m upward along the ramp? Assume that the coefficient of kinetic friction is uk = .35 and that you apply the force parallel to the plane.

uk mg cos(25) = (.35)(50)(9.8)cos(25) = 155N

Wfk = (155)(100)cos(180) = -15.5*10^3J

W = (100)(100)(1) = 1*10^4J

Wtot = 1*10^4 + 15.5*10^3 = 25.5*10^3J

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# Homework Help: Plane facts, I

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