A Figure Skater Rotating at 5 $2.25 \mathrm {~kg} \cdot \mathrm { m } ^ { 2 }$

Multiple Choice

A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of $2.25 \mathrm {~kg} \cdot \mathrm { m } ^ { 2 }$ If he pulls in his arms so his moment of inertia decreases to $1.80 \mathrm {~kg} \cdot \mathrm { m } ^ { 2 }$ angular speed? what will be his new

A) 4.60 rad/s
B) 0.81 rad/s
C) 2.25 rad/s
D) 6.25 rad/s