Constant Net Torque Question!?

Jessica

New member
A hollow sphere of radius 0.25 m is rotating at 13 rad/s about an axis that passes through its center. The mass of the sphere is 3.8kg. Assuming a constant net toque is applied, how much work is required to bring the sphere to a stop?

A 1.0 J
B 3.8 J
C 13 J
D 25 J
E 38 J

The answer is C, but I'm not sure how I get to the answer. Any help is appreciated. :]
 
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