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Statement of a problem № 16

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Two particles, 1 and 2, move with constant velocities v1 and v2 along two mutually perpendicular straight lines toward the intersection point O. At the moment t = 0 the particles were located at the distances l1 and l2 from the point O. How soon will the distance between the particles become the smallest? What is it equal to?

Solution:
Two particles, 1 and 2, move with constant velocities v1 and v2 along two mutual

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