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“直线外一点到直线的距离以垂线段为最短”(后简称“垂线段最短”)是一个几何结论,它可以解决物理中的一些最值问题．例1 某运动员与一平直公路的垂直距离为h,有一辆汽车以速度v0沿此公路匀速驶来．如图1,当汽车到达与运动员相距s的A点时, 运动员自B点开始匀速跑步(略去起跑时的加速过程),求运动员可以与汽车相遇的最小奔跑速度的大小和方向．
“The distance from the point outside the straight line to the straight line is the shortest vertical line” (hereinafter referred to as the shortest “vertical line segment”) is a geometrical conclusion. It can solve some of the most value problems in physics. Example 1 The vertical distance between an athlete and a straight road is h. There is a car traveling at a uniform speed v0 along this highway. As shown in Figure 1, when the car reaches point A, which is a distance s from the athlete, the athlete starts to run at a constant speed from point B (skipping the acceleration process at the start), asking for the size and direction of the minimum running speed that the athlete can meet with the car.