如图所示在竖直平面内用轻质细线悬挂一个小球将小球拉至a点使细线处于拉直状态由静止开始释放小球不计�擦小球可在ab两点间来回�动 Template


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tomski如图所示在竖直平面内用轻质细线悬挂一个小球将小球拉至a点使细线处于拉直状态由静止开始释放小球不计�擦小球可在ab两点间来回�动 coloring