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有这样一个题目:一支队伍长L,正在以速度υ_1匀速前进,通讯员为了传达命令,从队尾以速率υ_2由队尾跑到队首,又以不变的速率跑回队尾,在此过程中部队前进了多少?贵刊曾先后发表过两篇文章,分别用图象法和解析法求解,我认为如果变换参照物,可以使此问题乃至此类问题大大简化.思路如下:以队尾为参照物,通讯员以速度υ_2-υ_1走过位移L,然后以速度υ_1+υ_2返回队尾,设前
There is such a problem: a team leader, L, is moving at a constant speed of υ_1. The correspondent runs from the end of the team at the speed of 队_2 to the head of the team in order to convey the command, and runs back to the end of the team at a constant rate. How much did the troops advance in the process? Your magazine has published two articles, one for image processing and one for analytics. I think that if you change the reference, you can simplify this problem and even the problems. The idea is as follows: The tail is the reference object, the correspondent walks through the displacement L at speed υ_2-υ_1, and then returns to the end of the team with speed υ_1+υ_2.