Source: PhysicsBowl A chain of length 2d and mass 2m is placed over a frictionless table such that half of the rope is on the table; the other half dangling, and it is just starting to accelerate. Find its acceleration as a function of time. I couldn't get this one. I tried net force = ma (m+d)g = 2ma; where d represents the mass of the part of the chain that has slipped. But I can't get it in terms of t. Any help?