1. The problem statement, all variables and given/known data A thin rod of mass M and length L rests on a frictionless table and is struck L/4 from its CM by a clay ball of mass m moving at speed v. The ball sticks to the rod. Determine the translational and rotational motion. 2. Relevant equations Irod=1/12*M*R^2 I=mR^2 L=Iw or L=r*m*v L=constant 3. The attempt at a solution I figured out the answer for the first part, but the second part has me stuck. I got: m*v*L/4=(Irod+1/16*m*L^2)*w, where Irod=1/12*M*R^2 When i solve for w i get: [12m/(4M+3m)]*v/L However the textbook says the answer is: [12m/(4M+7m)]*v/l It looks like a made a mistake when calculating the moment of inertia for the clay blob, but i dont know where i made the mistake. I think it was in the beginning with Lbefore=Lafter, but i dont see it.