In the figure below, the mass of block A is 6.5 kg. The coefficient of static friction between the block and the surface on which it rests is 0.30 . The mass of w is 1.2 kg, and the system is in equilibrium. Find the friction force exerted on block A. a. 19.5 N b. 63.7 N c. 11.8 N d. 7.7 N