A wooden cube first floats inside water when a $200\,g$ mass is placed on it. When the mass is removed the cube is $2\,cm$ above water level. The side of cube is ........ $cm$

  • A

    $5$

  • B

    $10$

  • C

    $15$

  • D

    $20$

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  • [KVPY 2019]