The horizontal force P = 64 N is applied to the upper block with the system initially stationary. The block masses are ma = 18 kg and mg = 7 kg. Determine the magnitudes of the friction forces F, between block A and the ground) and F, (between blocks A and B) if the coefficients of static friction are u, = 0.29 and u, = 0.50 Assume that the coefficients of kinetic friction are 73 percent of the static values. P 20 A Answers: F = F2 = N