Two blocks connected by a rope of negligible mass are being dragged by a horizontal force (Fig. P5.43). Suppose $F=68.0 \mathrm{~N}, m_{1}=12.0 \mathrm{~kg}, m_{2}=18.0 \mathrm{~kg}$, and the coefficient of kinetic friction between each block and the surface is 0.100. (a) Draw a free-body diagram for each block. (b) Determine the tension $T$ and the magnitude of the acceleration of the system.