I had just asked a question about boats going across a river but that question and this question really have me stumped. 1. The problem statement, all variables and given/known data http://img138.imageshack.us/img138/7910/68512243.png [Broken] A)Find the acceleration using newtons laws B)Find the velocity using Conservation of Total Mechanical Energy. 2. Relevant equations Idisk=1/2mR^2 (what is R?) M1=T+Ff-MG=ma M2=1/2mR^2-t+t=ma M3=-T-Mg=ma I doubt these are right but I tried, I'm terrible at summing forces. 3. The attempt at a solution A)FnMuk-1.1(9.8)+1/2mR^2-t+t-t-Mg=m(a) I know I am way off but just so you can see I at least tried.