物体只在重力作用下自由下落时速度越来越快.一个小球从a点自由下落先后经过bc两点已知ab和bc的距离相等则重力在ab段和bc段做功的 Template




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tomski物体只在重力作用下自由下落时速度越来越快.一个小球从a点自由下落先后经过bc两点已知ab和bc的距离相等则重力在ab段和bc段做功的 coloring