Can anyone help me with this problem. I know that I need to find the total total forces for both blocks and combine them to solve for the acceleration and then use the acceleration to find the time. The problem is that I can't seem to get the correct value for the final answer. Thanks in advance 1.The lower block in the figure is pulled on by a rope with a tension force of 20 N. The coefficient of kinetic friction between the lower block and the surface is 0.30. The coefficient of kinetic friction between the lower block and the upper block is also 0.30. What is the acceleration of the 2.0 kg block?