1. The problem statement, all variables and given/known data Pretty picture: I am currently stuck on #1. 2. Relevant equations Not exactly sure but... For #1, I assume the relevant equations are those relating the (i) gravitational force to momentum and (ii)torque due to gravity to angular momentum: (i) F = dP/dt (ii) K = dM/dt, where K = r x F 3. The attempt at a solution I don't know how to begin. I figured maybe if I find r of the center of mass, take the absolute value of the derivative with respect to time then I'll know the speed...but where do I place the coordinate system then? Or I thought, if I use the equations listed above to find the momentum and angular momentum, I could do something with those to find the speed. I just don't know, quite confused right now.