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An ice dancer with her arms stretched out starts into a spin with an angular velocity of 2.3 rad/s. Her moment of inertia with her

An ice dancer with her arms stretched out starts into a spin with an angular velocity of 2.3 rad/s. Her moment of inertia with her arms stretched out is 2.75kg m. What is the difference in her rotational kinetic energy when she pulls in her arms to make her moment of inertia 1.23 kg m? (Answer in J)

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