InclinedPlanes
日期：2011-09-20 09:30:00
来源：作文地带
好评：优秀英语作文
作文地带导读：Since W = F · d, the work done by the force of friction is the product of the force of friction and the displacement of the box in the direction that the force is exerted. Because the force of friction is exerted in the negat...
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