现行高中必修课物理教材中,讲述了变速直线运动中的平均速度v=s/t,并且推导出匀变速直线运动质点在某一段时间的平均速度v=(v_0+v_t)/2(其中v_0和v_t分别是该段时间的初、末速度)。学生在学习中也只掌握到会运用这两个式子直接求出有关物理量,很少会灵活运用平均速度这个工具,下面列举3例。 In the current high school compulsory course physics textbook, the average speed v=s/t in the linear motion of speed change is described, and the average speed of the uniform linear motion mass at a certain time v=(v_0+v_t)/2 (where v_0 is derived And v_t are the beginning and end speeds of the period of time, respectively). In the course of learning, students only know that they will use these two formulas to obtain the relevant physical quantities directly, and they will seldom use the tool of average speed flexibly. The following are three examples.