3. [15 pts] A beginning pole yaulter [who weighs 820 N] practices 0.5 0.5 + 1 + 2 r by leaping a fence in his back yard. a. [8 pts) As he runs up, the 4 meter pole is held in horizontal U equilibrium as shown. What are the forces D and U if the weight of the pole (W) is 30 N? b. [8 pts) If he forgot to let go, and ended the way shown in ,\\ this figure, what force is the pole exerting on the wall? 1 Assume the wall is frictionless and can only exert a force Ki perpendicular to the wall. A correct free-body diagram is L necessary to get full credit for this part. A