Points A and B move along the x- and y-axes, respectively,
Chapter 3, Problem 3.116(choose chapter or problem)
Points A and B move along the x- and y-axes, respectively, in such a way that the distance r (meters) along the perpendicular from the origin to the line AB remains constant. How fast is OA changing, and is it increasing, or decreasing, when OB = 2r and B is moving toward 0 at the rate ofO.3r m/sec?
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