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wusuowei (wuxuowei) 于 (Mon Mar 19 11:27:22 2007) 提到:
The distance between two airplanes A and B is a at time 0. Plane A flying
north at speed v, and plane B will fly toward A at the same speed v. What is
the trajectory of B?
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wusuowei (wuxuowei) 于 (Mon Mar 19 15:56:40 2007) 提到:
Let me throw some stones here:
suppose A starts at origin, and B starts at (vt, 0). then establish the ODEs:
(dx/dt)^2 + (dy/dt)^2 = |
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