A Skater Extends Her Arms Horizontally,holding a 5-Kg Mass in Each

Multiple Choice

A skater extends her arms horizontally,holding a 5-kg mass in each hand.She is rotating about a vertical axis with an angular velocity of one revolution per second.If she drops her hands to her sides,what will the final angular velocity (in rev/s) be if her moment of inertia remains approximately constant at 5 kg.m²,and the distance of the masses from the axis changes from 1 m to 0.1 m?

A) 6
B) 3
C) 9
D) 4
E) 7