物体a和b用轻绳相连挂在轻弹簧下静止不动如图aa的质量为mb的质量为m当连接ab的绳突然断 开后物体a上升经某一位置时的速度大小为 Template




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tomski物体a和b用轻绳相连挂在轻弹簧下静止不动如图aa的质量为mb的质量为m当连接ab的绳突然断 开后物体a上升经某一位置时的速度大小为 coloring