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A student sits on a rotating stool holding two 2.0 kg objects. When his arms are extended horizontally, the objects are 1.0 m from the axis of rotation, and he rotates with an angular speed of 0.75 rad/s. The moment of inertia of the student plus stool is 3.0 kg·m2 and is assumed to be constant. The student then pulls the objects horizontally to 0.30 m from the rotation axis.

(a) Find the new angular speed of the student. in rad/s

(b) Find the kinetic energy of the student system before and after the objects are pulled in. in J. I need to know the before and after

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