Ok, I don't know what I'm really doing in this problem. It does not seem as hard as I am making it seem, but I guess I need help to be guided through it. Here's the problem: Blocks of mass 4, 8, and 12 kg are lined up from left to right in that order on a frictionless surface so each block is touching the next one. A rightward-pointing force of magnitude 18 N is applied to the left-most block. A) What is the magnitude of the force that the middle block exerts on the rightmost one? B) What is the magnitude of the force that the leftmost block exerts on the middle one? C) Suppose now that the left-right order of the blocks is reversed. Now find the magnitude of the force that the leftmost block exerts on the middle one? Can anyone help me??