A homogeneous cubic block of side L and weight 200 N resting on a horizontal floor is acted upon by a force of 100 N at an angle of 60 to the horizontal as shown in the figure. If the coefficient of friction is 0.3, the magnitude of the frictional force between the block and the floor is 200N 100N 60 (a) 0 N (c) 86 N L/2 L/2 k L + (b) 50 N (d) 100 N