20. (8 pts) A person bends over at 40 from the horizontal to lift a heavy object as shown in the figure. The weight of the trunk is W = 250 N acting at 30 cm from the base of the spine (0) and the weight of the upper extremities and object are W2- 200 N and act at 50 cm from the base of the spine. Draw the free body diagram and determine the reaction forces and moments in the joint at the base of the spine. W. 0 = 40