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Studio 2053C Fall 2016: Energy and Work An eraser of mass m = 0.120 kg is released from rest at a distance L = 0.750 m from the bottom of a whiteboard, which is inclined at an angle of 30.0° to the horizontal. The coefficient of kinetic friction between the eraser and whiteboard is μ,-0.125. Use g= 9.81 m/s (1) What is the work done by gravity as the eraser moves from where it is released to the bottom of the whiteboard? (2) What is the magnitude of the kinetic friction force acting on the eraser during its motion? (3) What is the work done by friction as the eraser moves from where it is released to the bottom of the whiteboard? (4) How fast is the eraser moving when it reaches the bottom of the whiteboard?

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30 グ 30 rm Sin (,, o Rox7.glxs.n80 X0.75) = 0.0441.(0,1274 x075)可 0 0165 J

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