1. The problem statement, all variables and given/known data Problem: http://imgur.com/a/Sw2zA Hi all, I was given this problem as homework and I have almost no clue on how to solve it. I have tried for some time with no luck. 2. Relevant equations We learned about kinetic and potential energy as well as work. W = F*d W = delta KE PE = m*g*h 3. The attempt at a solution I tried using the second work formula I have written, yet in the problem the ring stars with Kinetic energy of 0 and ends with Kinetic energy of 0, yet the ring still traveled some distance. This is another part I don't understand. If the ring traveled a distance, how come the work on the ring is 0?