Meriam, Kraige & Bolton — Plane Kinematics of Rigid Bodies: Problem 5_128

5/128 The cars of the roller coaster have a speed \( v = 25 \text{ ft/sec} \) at the instant under consideration. As rider \( B \) passes the topmost point, she observes a stationary friend \( A \). What velocity of \( A \) does she observe? At the position under consideration, the center of curvature of the path of rider \( B \) is point \( C \).