Explanation
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In free space, a solid sphere rotates.
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Because there is no external tension, angular momentum will be conserved.
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As r varies, the moment of inertia will vary as.1= 2/5 mr2
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As,1ω =constant the angular velocity will vary.
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As 1/21ω2, rotational kinetic energy will also vary.
Final Answer
The correct option is B i.e Angular momentum.