A very large block of ice of the size of a volleyball court and of uniform thickness of $8 \,m$ is floating on water. A person standing near its edge wishes to fetch a bucketful of water using a rope. The smallest length of rope required for this is about ............... $m$

  • [KVPY 2018]
  • A

    $3.6$

  • B

    $1.8$

  • C

    $0.9$

  • D

    $0.4$

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  • [KVPY 2017]