One block of mass 5.00 kg sits on top of a second rectangular block of mass 15.0 kg, which in turn is on a horizontal table. The coefficients of friction between the two blocks are μs = 0.300 and μk = 0.100. The coefficients of friction between the lower block and the rough table are μs = 0.500 and μ-k = 0.400. You apply a constant horizontal force to the lower block, just large enough to make this block start sliding out from between the upper block and the table.
(a) Draw a free-body diagram of each block, naming the forces on each.
(b) Determine the magnitude of each force on each block at the instant when you have started pushing but motion has not yet started. In particular, what force must you apply?
(c) Determine the acceleration you measure for each block.