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A student on a piano stool rotates freely with an angularspeed of 3.07 rev/s. The student holds a 1.39 kg mass in eachoutstretched arm, 0.759 m from the axis of rotation. The combinedmoment of inertia of the student and the stool, ignoring the twomasses, is 4.72 kg m^2, a value that remains constant. As thestudent pulls his arms inward, his angular speed increases to 3.54rev/s. How far are the masses from the axis of rotation at thistime, considering the masses to be points? Calculate the initial and final kinetic energy of the system?

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