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iniforever (Rain) 于 (Thu Sep 28 15:28:17 2006) 提到:
Not from any quant interview, but this problem is really interesting, high
school phys competition problem.
Two rockets have the same speed v. The original distance is L. At the
beginning, one is moving perpendicularly to the line segment between the two
rockets, and its speed and direction is unchanged. The other is always
aiming at the first one. So, what is the final distance of these two rockets
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