Meriam, Kraige & Bolton — Plane Kinematics of Rigid Bodies: Problem 5_115

5/115 The system of Prob. 5/68 is repeated here. If the vertical rod has a downward velocity \( v = 2.5 \text{ ft/sec} \) and an upward acceleration \( a = 3.6 \text{ ft/sec}^2 \) when the device is in the position shown, determine the corresponding angular acceleration \( \alpha \) of bar \( AB \) and the magnitude of the acceleration of roller \( B \). The value of \( R \) is \( 16 \text{ in.} \)