_______________________________________-_____________________________________________.r _> A block is pressed against a vertical wall by a force F , as the drawing shows. '51 O This force can either push the block upward at a constant velocity or allow it to slide downward at a constant velocity. The magnitude of the force is different in the two cases, while the directional angle 6 is the same. Kinetic friction exists between the block and the wall, and the coefcient of kinetic friction is 0.270. The weight of the block is 59.0 N, and the directional > > angle for the force F is 0 = 33.0. Determine the magnitude of F when the block slides (a) up the wall and (b) down the wall.