Meriam, Kraige & Bolton — Plane Kinetics of Rigid Bodies: Problem 6_187

6/187 The 60-ft telephone pole of essentially uniform diameter is being hoisted into the vertical position by two cables attached at B as shown. The end O rests on a fixed support and cannot slip. When the pole is nearly vertical, the fitting at B suddenly breaks, releasing both cables. When the angle \(\theta\) reaches \(10^\circ\), the speed of the upper end A of the pole is \(4.5\text{ ft/sec}\). From this point, calculate the time \(t\) which the workman would have to get out of the way before the pole hits the ground. With what speed \(v_A\) does end A hit the ground?