I keep getting this problem wrong and I don't know why. maybethe wrong formula? please help?
A student sits on a freely rotating stool holding two weights,each of mass 3.05 kg. When his arms are entended horizonatally, theweights are 0.97 m from the axis of rotation and he rotates with anangular speed of 0.759 rad/s. The moment of inertia of the studentplus stool system is 3.05 kg/m2 and is assumed to be constant. thestudent plus the weights inward horizontally to a position 0.301 mfrom the rotations axis. what is the new angular speed of thestudent? Find the kinetic enrgy of the rotating sstem before andafter he pulls the weights inward.
I thought you used the formula w f=(I i/I f) wi     (where the "w" is the angularvelocity)   but that's not right, so what am i doingwrong? I don't even know how to attempt the last question.


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