In Figure 5-50a, a constant horizontal force a is applied to blockA, which pushes against blockBwith a 18.0 N force directed horizontally to the right. In Figure 5-48b, the same force is applied to blockB; now blockApushes on blockBwith 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 5-50aand(b)force a?

Fig. 5-50

Problem 52.