He must push it nine feet, doing the same work (providing the same energy) that he would use to lift 120 pounds three feet, which is 360 ft-lb. To do the same work in nine feet, the force (disregarding friction) along the ramp will be 40 pounds. That's too easy. Got any hard problems?
Skydrol is mean stuff. If it leaks, it'll take the paint right off the pickup bed.
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-- Carl
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