1. The problem statement, all variables and given/known data A student sits at rest on a piano stool that can rotate without friction. The moment of inertia of the student-stool system is 3.6 kg·m2. A second student tosses a 1.7 kg mass with a speed of 3.0 m/s to the student on the stool, who catches it at a distance of 0.38 m from the axis of rotation. The final angular speed is 0.504 rad/s. (a) Does the kinetic energy of the mass-student-stool system increase, decrease, or stay the same as the mass is caught? (b) Calculate the initial and final kinetic energy of the system. 2. Relevant equations W=Kf-Ki ω=v/r 3. The attempt at a solution All I've gotten so far is Ki=3.6+.5*1.7*3^2=11.25 J. I'm really stuck, please help!