1。永远不能相遇,或者题目给的不对2。缺少条件
unless think in this way:
at moment t.
relative move to string is .01-(t+int(ds)|t)/L
L is string length at t, which is 1+t
it's a double integral problem. but think in extreme condition.
if the worm is not a dot but a length, one side will remain at origin and the other side will reach at end line at 100 sec time.
so the answer can be from 100 sec to infinity depends what kind of motion worm move together with string.
第一题:如果你觉得永远不能相遇请给出理由
实际上,对一般的正n边形来说,根据对称性原则,在任意时刻t,这n只虫子还是构成一个正n边形,而且是比任何前一时刻构成的正n边形小。缩小的速度是可以求出来的。