The hydraulic cylinder imparts a constant upward velocity va= 0.2 m/s to comer A of the rectangular container during an interval of its motion. For the instant when 0= 20°,

detemine the velocity vg and acceleration as of roller B. Also, determine the corresponding angular velocity o of edge CD. The velocity and acceleration of B are positive if to the right, negative if to the left. The angular velocity of CD is positive if counterclockwise, negative if clockwise.