[SOLVED] Block on a table 1. The problem statement, all variables and given/known data http://img91.imageshack.us/img91/4285/fudgepq5.th.png [Broken] I am having some trouble finding the acceleration of the blocks, can anyone help me? The weight of B is 6 lbs. The weight of A is 5 lbs. The friction coef is .3 2. Relevant equations 3. The attempt at a solution 1) The positive y axis goes from left to right sum of forces in y = (6/32)*ab = 2T - 1.8 2) positive y axis goes from top to bottom sum of forces in y = (5/32)*aa = 5-T I know that aa = -2ab The way my book derives the relationship between aa and ab is from 'dependent motion' they say that length = sa + 2sb and taking the time derivative twice is 0 = aa + 2ab, the problem is with the way I have my equations setup, when i use aa = -2ab i get the wrong answer, does anyone know how I can fix it so I am using aa = -2ab and getting the correct answer? I don't see anything wrong with my equations, but i am getting the wrong accelerations. Can anyone help?