1. The problem statement, all variables and given/known data A 60kg skater begins a spin with an angular speed of 6 rad/s. By changing the position of her arms, the skater decreases her moment of intertia by 50%. What is the skater's final angular speed? 2. Relevant equations I understand that I=m*(r^2), so if the radius decreases when she puts her arns in, then the initertia decreases. 3. The attempt at a solution My attempt at this is that since it decreases by 50%, then the angular speed must increase by two to compensate. Is this correct and that her final speed is 9 rad/s?