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a. What is the resulting angular velocity?

b. By what factor does the skater's kinetic energy change?

For a, I use IW = I'W' >> 1(4rad/s) = (1-.075)W', then solve for W'

I got 4.32 rad/s for W'. I don't know if I'm doing it correctly. Also, I need help on part b.

Thx