题目:物体做匀变速直线运动的初速度为v0,经过时间t后速度变为vt经过的位移为x.我们把t/2时刻叫做中间时刻对应的速度即为中间时刻的瞬时速度,用vt/2表示.而运动一半位移即x/2处为中间位置,中间位置的瞬时速度用vx/2表示.那么这两个速度哪一个大?讲解是vx/2>vt/2.一般情况老师只介绍一种或两种方法,往往考试出现了,学生的错误率很高.现在这里介绍五种方法 Title: The object to do variable speed linear motion of the initial velocity of v0, after the time t after the velocity vt displacement through the x. We call t / 2 moment is the middle of the corresponding moment is the instantaneous speed of the intermediate moment, with vt / 2, and half of the movement that x / 2 at the middle position, the middle position of the instantaneous speed vx / 2 said, then these two speeds Which? Explained is vx / 2> vt / 2. Only introduce one or two methods, often exams appear, the error rate of the student is very high. Now introduce five kinds of methods here