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然后让小球以初速度v0从a点开始运动不计�擦和空气阻力 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然后让小球以初速度v0从a点开始运动不计�擦和空气阻力 coloring