为了将一重为2000n的物块送到高处,工人师傅用木板和�轮搭建了如图所示的装置。用大小为1000n的拉力f拉动绳端,物块在20s内从地面沿斜面 Template




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tomski为了将一重为2000n的物块送到高处,工人师傅用木板和�轮搭建了如图所示的装置。用大小为1000n的拉力f拉动绳端,物块在20s内从地面沿斜面 coloring