A body weighs $700\,gm\,wt.$ on the surface of the earth. How much will it weigh on the surface of a planet whose mass is $\frac {1}{7}$ and radius half of that of the earth ....... $gm\, wt$

  • A

    $200$

  • B

    $400$

  • C

    $50$

  • D

    $300$

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