If the rotating mass of a rim type flywheel is distributed on another rim type fly wheel

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If the rotating mass of a rim type flywheel is distributed on another rim type fly wheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be

(a) four times the first one

(b) same as the first one

(c) one-fourth of the first one

(d) two times the first one

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