Fig. 5-1a shows two blocks on a smooth surface. A constant horizontal force Fa is applied to block A, which pushes against block B with a 28.0 N force horizontally to the right. In Fig. 5-1b, the same force Fa is applied to block B so that block A pushes on block B with a 14.0 N force horizontally to the left. The blocks have a total mass of 30.0 kg. Fig. 5-1 (a) What is the magnitude of the acceleration of the blocks in Fig. 5-1a? what i tried was F=ma so 28=30a so 28/30=a (b) What is the magnitude of the force Fa?