A block is pressed against a vertical wall by a force F-->, as the drawing shows.
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 F θ is the same. Kinetic friction exists between the block and the wall, and the coefficient of kinetic friction F-> is 0.330. The weight of the block is 51.0 N, and the directionangle for the force is θ = 38.0°. Determine the magnitude of when the block slides (a) up the wall and (b) down the wall.