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Statement of a problem № 13

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Point A moves uniformly with velocity v so that the vector v is continually "aimed" at point B which in its turn moves rectilinearly and uniformly with velocity u< v. At the initial moment of time v _|_ u and the points are separated by a distance 1. How soon will the points converge?

Solution:
Point A moves uniformly with velocity v so that the vector v is continually

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