一、基本比例:初速度为零、加速度一定的匀变速直线运动的12种比例关系:1.前t秒末、前2t秒末、……、前nt秒末的瞬时速度之比:1∶2∶3∶……∶n. 2.前t秒内、前2t秒内、……、前nt秒内的位移之比:12∶22∶32∶……∶n2. 3.前t秒内、前2t秒内、……、前nt秒内的平 First, the basic ratio: the initial speed of zero, the acceleration of a certain constant speed linear movement of the 12 kinds of proportional relations: 1. At the end of t seconds, before the end of 2t seconds, ..., the ratio of the instantaneous speed before the end of nt seconds: 1: 2:3:...:n. 2. Ratio of displacement in the first t seconds, within the first 2t seconds, ..., before the nt seconds: 12:22:32:...:n2. 3. Within the first t seconds In the first 2t seconds,..., in the first nt seconds.