B PROBLEM 15.38 30 An automobile travels to the right at a constant speed of 80 km/h. If the diameter of a wheel is 500 mm, determine the velocities of 90 Points B, C. D. and E on the rim of the wheel E 500 mm PROBLEM 15.39 The motion of rod AB is guided by pins attached at A and B. which slide in the slots shown. At the instant shown, 0 = 40° and the pin at B moves upward to the left with a constant velocity of 150 mm/s Determine (a) the angular velocity of the rod, (b) the 500 mm velocity of the pin at end A. 15 B