An Ice Skater Has a Moment of Inertia of 5

Multiple Choice

An ice skater has a moment of inertia of 5.0 kg ∙ m² when her arms are outstretched,and at this time she is spinning at 3.0 rev/s.If she pulls in her arms and decreases her moment of inertia to 2.0 kg ∙ m²,how fast will she be spinning?

A) 2.0 rev/s
B) 3.3 rev/s
C) 7.5 rev/s
D) 10 rev/s