1. The problem statement, all variables and given/known data In Figure 5-50a, a constant horizontal force F->a is applied to block A, which pushes against block B with a 23.0 N force directed horizontally to the right. In Figure 5-48b, the same force is applied to block B; now block A pushes on block B with a 11.0 N force directed horizontally to the left. The blocks have a combined mass of 12.0 kg. What are the magnitudes of (a) their acceleration in Figure 5-50a and (b) force F->a? 2. Relevant equations Fnet=m*a http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c05/fig05_50.gif 3. The attempt at a solution Ok so for block scenario one I have to find the Fnet to solve for m*a. So I have Fnet= sum of forces=m*a for case two Fnet= sum of forces =m*a So I have 12*a= Fapp+23-F_AB 12*a=Fapp-11+F_AB I am stuck right here any tips?