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please help me, What is her angular velocity after she pulls her arms in and reduces her rotational inertia to?

A skater is initially spinning at a rate of 12.7 rad/s with a rotational inertia of 2.91 kg · m2 when her arms are extended. What is her angular velocity after she pulls her arms in and reduces her rotational inertia to 1.64 kg · m2?

Public Comments

1. Angular momentum = Inertia x rad/s 2.91 x 12.7 = 36.957 kg-m^2/s momentum before = momentum after 36.957/1.64 = 22.534 rad/s