A heavy box, full of parts for your pumpkin launcher, arrives at the sidewalk ou

Question

A heavy box, full of parts for your pumpkin launcher, arrives at the sidewalk outside your dorm building. There is a ramp from the sidewalk, having an angle of incline of theta = 15[ degree ] to the horizontal, that leads from the sidewalk to the building lobby. The change in elevation from the bottom to the top of the ramp is 62.1 [in]. The box weighs 64.9[lbs] and the dynamic coefficient of friction between the box and ramp is mud = 0.41[-], how much work must you expend, in [J], to push the box up the ramp? If you are applying the force by pushing on the box, and your forearms make an angle of phi = 45[ degree ] to the horizontal, then what force, expressed in units of [lbf], must you exert in order to keep the box moving at constant speed

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