全国中等卫生学校教材《物理学》 (第三版，成都科学技术出版社出版 )第 23页，有一道例题原题及求解过程是这样的： 求跑步的最大速度。 解：人体由静止开始跑步，在达到一稳定的速度之前是变 速运动，设人腿能产生的最大力等于人体重的 1.5倍， 即 1.5mg， m为人体质量；又若 National secondary health school teaching material “Physics” (third edition, Chengdu Science and Technology Press) p. 23, there is a sample of the original title and solving process is this: seeking maximum speed running. Solution: The human body begins to run from rest, before reaching a stable speed, it is a variable speed movement. The maximum force that a human leg can produce is equal to 1.5 times of human body weight, that is, 1.5mg, m is the body mass;