If link AB of the four-bar linkage has a constant counterclockwise angular velocity of 41 rad/s during an interval which includes the instant represented, determine the angular acceleration of AO (positive if counterclockwise, negative if clockwise) and the acceleration of point D. 90 mm B 245 mm Answers: AO = i 150 mm 150 mm L-x A rad/s aD= (i i+ i j) m/s