90. assignment (conservation of angular momentum)

A figure skater during her finale can increase her rotation rate from an initial rate of 1.12 revolutions every 2.00s to a final rate of 3.09 revolutions per second. If her initial moment of inertia was 4.45kg*m2, what is her final moment of inertia?

Video description:
https://youtu.be/n09CypvEN_0