Problem 3-57: A stationary truck is carrying a worker in its cockpit to replace street lights. At the instant sketched in the figure on the right, all members are in the plane of the sketch, and the base A is rotating about a vertical axis at an angular velocity w, = 0.25 rad/s and an angular acceleration @, = 0.15 rad/s?, both with respect to ground. The main arm AB forms an angle of 40 with respect to the vertical. The forearm BC is rotating at an angular velocity w, = 0.20 rad /s and an angular acceleration @, = 0.35 rad/s?, both with respect to the main arm AB. The forearm is rotating about an axis that is orthogonal to the plane of the sketch, and it forms an angle of 50 with respect to the vertical. The lengths of the main arm and the forearm are 4.5 m and 2.5 m, respectively. A worker, weighing 200 Ib, is standing in the cockpit, and can be modeled as being at point C. Note that gravity acts. Find the velocity and acceleration of the worker at the instant shown