A) the angular velocity decreases
B) the moment of inertia decreases
C) the angular velocity stays constant
D) the angular momentum increases
Correct Answer: B
Solution :
Since no external torque act on gymnast, so angular momentum (L= Iw) is conserved. After pulling her arms & legs, the angular velocity increases but moment of inertia of gymnast, decreases in, such a way that angular momentum remains constant.
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