Meriam, Kraige & Bolton — Kinematics of Particles: Problem 2_138

2/138 A helicopter starts from rest at point A and travels along the indicated path with a constant acceleration \(a\). If the helicopter has a speed of 60 m/s when it reaches B, determine the values of \(\dot{R}\), \(\dot{\theta}\), and \(\dot{\phi}\) as measured by the radar tracking device at O at the instant when \(h = 100\text{ m}\).