Block A and B weigh 100 lb and 60 lb respectively. If block A has a center of gravity at G as shown, determine the largest horizontal force P that causes impending motion of the block B. The dimensions are: L1= 8 in, L2 = 14 in, and h = 6 in. The coefficient of static friction at each set of surfaces are as follows: C (μs = 0.60), D (μs = 0.20), and E (μs = 0.30).