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* 64. A block is pressed against a vertical GO wall by a force P, as the drawing shows. This force can either push the block upward at a con- stant 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 θ is the same. Kinetic friction exists be- tween the block and the wall, and the coefficient of kinetic friction is 0.250. The weight of the block is 39.0 N, and the directional angle for the force P is θ 30.0°. of P when the block slides (a) up the wall and (b) down the wall. Determine the magnitude

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