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在追及、碰撞问题中,当两个物体速度相同(即相对速度为零)时,通常伴随着某些物理特征出现。如果我们在解题时,能弄清楚并加以区别“速度相同”时系统出现的不同特征,各种追、撞总是便很易求解。下面结合具体范例作分类分析。1两车速度相同时,相距最远(或最近)的问题例1一辆汽车以v=30m/s的速度在平直公路上行驶。在它经过公路上的某处A时,A处的一辆摩托车正以5m/s2的加速度从静止开始
In the tracking and collision problems, when two objects have the same speed (that is, the relative speed is zero), some physical features usually appear. If we can figure out and distinguish the different features of the system when we solve the problem, we can always easily solve the various chases and collisions. The following is a combination of specific examples for classification analysis. 1 The problem of the farthest (or most recent) problem when two vehicles are at the same speed Example 1 A car is driving on a straight highway at v=30m/s. As it passes somewhere A on the highway, a motorcycle at A is starting from a standstill with an acceleration of 5m/s2.