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１问题的提出 高中物理中经常会遇到两个物体何时分离的问题．举一个常见的例子：如图１，光滑水平面上有Ａ、Ｂ两个物体质量分别为ｍＡ和ｍＢ，ｍＡ和一弹簧相连，弹簧的另一端固定在墙上．开始先用作用在Ｂ上的水平外力Ｆ压缩弹簧．然后撤去外力，问Ａ和Ｂ两个物体何时开始分
1Problem raised in high school physics often encounter the problem of when two objects separated. A common example is shown in Fig. 1. On the smooth horizontal surface, there are A and B. The masses of the two objects are mA and mB respectively. The mA is connected to a spring and the other end of the spring is fixed to the wall. Begin by compressing the spring with a horizontal force F acting on B. Then remove the external force and ask when the two objects A and B begin to