1. The problem statement, all variables and given/known data Block A (of mass MA) rests on a frictionless horizontal table. It is connected via a light string to block B (of mass MB) hanging over the edge of the table. The pulley itself, a solid disc, has non-negligible mass MC. The light string does not slip over the pulley. What is the magnitude of the linear acceleration of the system? Edit: Messed up with the title! This problem is in the chapter of Conservation of Momentum in my book but I actually didn't use it for this problem. 2. Relevant equations Στ=Iα α=a/r Moment of Inertia of a disk = 1/2mr^2 3. The attempt at a solution So here's my attempt but I'm not sure where I'm messing up.