1. The problem statement, all variables and given/known data The 1.0 kg block in the figure (attached) is tied to the wall with a rope. It sits on top of the 2.0 kg block. The lower block is pulled to the right with a tension force of 20 N. The coefficient of kinetic friction at both the lower and upper surfaces of the 2.0 kg block is mu_k = 0.500. What is the tension in the rope holding the 1.0 kg block to the wall? What is the acceleration of the 2.0 kg block? 2. Relevant equations F_a on b = -F_b on a a_ax = - a_bx 3. The attempt at a solution I started by drawing force diagrams for both boxes and then calculating the net force in the x-direction for each box. For box 1: Fnet x = -T_1 - (mu_k)(n) = -1T_1 - (0.5)(9.8)(1) = -1T_1 - 4.9 For box 2: Fnet x = T_2 - 2(mu_k)(n) = 20 - (2)(0.5)(20.6) = -0.6 At this point, I've tried to find the acceleration by setting the Fnet = ma, but get the wrong answer for the acceleration and solving for T_1. Anyone know where I may be making the mistake?