Block A in the figure weighs 68 N . The coefficient of static friction between the block and the surface on which it rests is 0. The weight is 12 N...

Block A in the figure weighs 68 N . The coefficient of static friction between the block and the surface on which it rests is 0.320. The weight is 12 N and the system remains at rest.Find the friction force exerted on block A.Find the maximum weight for which the system will remain at rest.