A skylab of mass $m\,kg$ is first launched from the surface of the earth in a circular orbit of radius $2R$ (from the centre of the earth) and then it is shifted from this circular orbit to another circular orbit of radius $3R$ . The minimum energy required to shift the lab from first orbit to the second orbit are

  • A

    $\frac {mgR}{6}$

  • B

    $\frac {mgR}{12}$

  • C

    ${mgR}$

  • D

    ${mgR}$

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