Extracted text: The horizontal force P = 50 N is applied to the upper block with the system initially stationary. The block masses are ma = 10 kg and mg = 5 kg. Determine if and where slippage occurs for the fol- lowing conditions on the coefficients of static fric- tion: (a) u = 0.40, uz = 0.50 and (b) p = 0.30, uz = %3D 0.60. Assume that the coefficients of kinetic friction are 75 percent of the static values. B 15° A