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第19届全苏中学生物理奥林匹克竞赛九年级有这样一道试题: “把小球以初速v_1竖直上抛,球到地时的速度为v_2,试求小球飞行的时间,假设小球运动时所受的空气阻力跟它的速度成正比.” 何熙文编译的《中学生物理奥林匹克竞赛试题及解答》(西南师大)中给出的解答是这样的:
In the 19th All-Soviet Junior High School Physics Olympiad in the ninth grade, there was a question: “Put the ball at the initial speed v_1 up and down, and the speed when the ball hits the ground is v_2. Try to find the time for the ball to fly. Suppose the ball is in motion. The air resistance is proportional to its speed.“ The answers given by He Xiwen’s ”Middle School Student Physics Olympiad Test Questions and Answers" (Southwest Normal University) are as follows: