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Physics 9 Online
OpenStudy (anonymous):

A man is dragging a 68 kg trunk up the loading ramp of a mover's truck .The ramp has a slope of angle 20 degrees, and the main pulls upwad with a force F whose direction makes an angle of 30 degrees with the ramp. The coefficient of kinetic friction between trunk and the ramp is 0.28. What force F is necessary to accelerate the trunk up the loading ramp at a rate of 0.55m/s^2.?

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