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2000年全国初中物理知识竞赛(初三组初赛)第九题:一队战士正匀速胶进,队伍长1200米,一个通讯员骑马从队尾赶到排头,传令后又返回队尾时,队伍前进了900米,通讯员从队尾到排头,再回到队尾共通过的路程是多少?此题的常规思维是选择队伍为参照物,抓住时间相等来建立关系式.一般解法为设通讯员共通过路程为 S,通讯员的速度为 V_1,队伍的行进速度为 V_2.根据题意有:
The Ninth National Physics Knowledge Competition for Junior High School (2000 junior high school competition) in 2000: A team of soldiers is glued in a uniform and the team is 1200 meters long. A correspondent rides from the end of the team to the top, and when the team returns to the end of the team, the team advances. 900 meters, the correspondent from the end of the team to the top, and then go back to the end of the team to pass the number of what? The conventional thinking of this question is to select the team as a reference, to seize the time equal to establish a relationship. The general solution for the establishment of a total of correspondents Through the distance S, the speed of the correspondent is V_1, and the team’s speed is V_2. According to the questions, there are: