An object of mass $m$ moves with constant speed in a circular path of radius $R$ under the action of a force of constant magnitude $F$. The kinetic energy of object is ............

  • A

    $\frac{1}{2} F R$

  • B

    $FR$

  • C

    $2 F R$

  • D

    $\frac{1}{4} F R$

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