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Point A moves uniformly with velocity nu...

Point A moves uniformly with velocity `nu` so that the vector `v` is continually "aimed" at point B which in its turn moves rectilinearly and uniformly with velocity `upsilon lt nu`. At the initial moment of time `v_|_u` and the points are separated by a distance `l`. How soon will the points converge?

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The correct Answer is:
`[(vl)/(v^(2)-u^(2))]`
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