高中物理,一个杆连两个球,�知道整个系统机械能守恒,但如何判断杆对两球做功代数和为0 知乎 Template




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tomski高中物理,一个杆连两个球,�知道整个系统机械能守恒,但如何判断杆对两球做功代数和为0 知乎 coloring