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1.平均速度用来粗略地描述做变速运动的物体的平均快慢程度,知道了一个做变速运动的物体的平均速度,就大体上知道了它运动的快慢,但不能精确地知道它的运动情况,即不知它何时加速,何时减速,何时中途停留.也不能准确说明物体每时每刻的位置?2.计算平均速度时,必须指明是哪一段路程上或哪一段时
1. The average speed is used to roughly describe the average speed of an object doing variable speed movements. Knowing the average speed of an object doing speed change, it generally knows the speed of its movement, but it cannot accurately know its movement. That is, when does it not know when it accelerates, when it slows, and when it stops halfway, it can’t accurately describe the position of the object at every moment? 2. When calculating the average speed, you must specify which route or which time