Question: A circular track has several concentric rings where people can run at their leisure. Phil runs on the outermost track with radius r P while

A circular track has several concentric rings where people can run at their leisure. Phil runs on the outermost track with radius r_P while Annie runs on an inner track with radius r_A = 0.80r_P. The runners start side by side, along a radial line, and run at the same speed in a counterclockwise direction. How many revolutions has Annie made when Annie’s and Phil’s velocity vectors point in opposite directions for the first time?

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To solve this problem we can use the fact that the velocity vectors of Phil and Annie are perpendicular when they are pointing in opposite directions ... View full answer

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