如图所示一轻绳跨过定�轮两端分别悬挂物块a和b两物块质量分别为mamb先用手托住两物体保持静止放后手a下降而b 上升.重力加速度为 Template




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tomski如图所示一轻绳跨过定�轮两端分别悬挂物块a和b两物块质量分别为mamb先用手托住两物体保持静止放后手a下降而b 上升.重力加速度为 coloring