A student sits on a rotating stool holding two 1 kg objects. when his arms are extended horizontally, the objects are 1 m from the axis of rotation, and he rotates with angular speed of 0.79 rad/sec. the moment of inertia of the student plus the stool is 4 kgm² and is assumed to be constant. the student then pulls the objects horizontally to a radius 0.36 m from the rotation axis. calculate the final angular speed of the student. answer in units of rad/s.
a) 0.53 rad/s
b) 0.62 rad/s
c) 0.71 rad/s
d) 0.84 rad/s
