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大一物理 一個題目 請大家幫忙 急!!
A physics professor is pushed up a ramp inclined upward at 30.0度above the horizontal as he sits in his desk chair that slides onfrictionless rollers.the combined mass of the professor and chair is85.0kg.he is pushed 2.50m along the incline by a group of students whotogether exert a constant horizontal force of 600N.the professor
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