1. An object of weight 25.0 N is placed on a rough plane inclined at 30 to the horizontal as shown in Figure 1. The coefficient of kinetic friction of the object and the surface is 0.20. A horizontal force, F acting on the object causes it to moves upward along the inclined plane with a constant velocity. Horizontal force, F 30 Figure 1 (a) Determine the magnitude of the force, F. (b) Calculate the frictional force.