12-12 12-12.If slider C in Figure P12-12 moves downward at 0.7 m/s, determine (a) the angular velocity of AB and (b) the velocity of D. 12-21 250 mm 150 mm B 14 cm IN 200 mm 125 mm FIGURE P12-12 12 cm 300 mm 0 * 5 cm 15 cm FIGURE P12-21 12-21.The angular velocity of AB = 2 rad/s clockwise in Figure P12-21. Using the relative velocity equation, determine (a) the velocity of point C, (b) the angular velocity of CBD, and (c) the velocity of point D.