A runner sprints around a circular track of radius 100 m at a constant speed of 7 m!s
Chapter 3, Problem 3.9.43(choose chapter or problem)
A runner sprints around a circular track of radius 100 m at a constant speed of 7 m!s. The runners friend is standing at a distance 200 m from the center of the track. How fast is the distance between the friends changing when the distance between them is 200 m?
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