A flywheel is in the form of solid circular disc of mass $72\,kg$ and radius of $0.5\,m$ and it takes $70\, r.p.m.$ , then the energy of revolution approximately is ....... $J$.

  • A

    $24$

  • B

    $240$

  • C

    $2.4$

  • D

    $2400$

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