一、公式法例1 一物体在水平地面上受到一水平拉力作用由静止开始匀加速前进10m 后,撤去这个水平拉力,物体又向前滑行50m才停止.求该物体在这两个阶段中的运动时间之比t1:t2. 解析物体在第一阶段的平均速度为(v1)|-(0+v)/2,式中的v为第一阶段的末速度, 物体在第二阶段的平均速度为(v2)|-(v+0)/2, I. Formula Example 1 After an object has been subjected to a horizontal tension on a level ground, it accelerates for 10m from a static start and then pulls this level of tension. The object then slides forward for 50m before stopping. Find the object in these two phases of movement. The ratio of time t1:t2. The average velocity of the analytical object in the first phase is (v1)|-(0+v)/2, where v is the final velocity of the first phase and the average velocity of the object in the second phase. Is (v2)|-(v+0)/2,