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-It undergoes a change by an amount that obviously depends on how fast the skater pulls her arms in.

-It decreases by a factor of two.

-It is zero because her center of mass is stationary.

-It increases by a factor of four.

-It decreases by a factor of four.

-It remains constant.

-It increases by a factor of two.

I know that Ki = (1/2)Iω2 , so isn't her Kf = (1/2)(I/2)(2ω2) = (1/2)Iω2 = Ki ???

Doesn't the angular speed increase by a factor of two as well?

My guess would be "It remains constant" (And I can only choose one)

Can anyone give me advice on this problem? Thank you

Kevin