A crate of mass 30 kg is pushed up a ramp by a person as shown in the figure bel

Question

A crate of mass 30 kg is pushed up a ramp by a person as shown in the figure below. The person pushes the crate a distance of 32 m as measured along the ramp. Assume the crate moves at constant velocity. Assume the coefficient of kinetic friction between the crate and the ramp is

Find the work done by gravity on the crate.
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A crate of mass 30 kg is pushed up a ramp by a person as shown in the figure below. The person pushes the crate a distance of 32 m as measured along the ramp. Assume the crate moves at constant velocity. Assume the coefficient of kinetic friction between the crate and the ramp is ?K = 0.35. Find the work done by gravity on the crate.

Explanation / Answer

Work done by gravity on the crate = -mgsin(theta) * s = -(30 * 9.8 * sin(30 degree) * 32) = -4704 J

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