A mass of $1\, kg$ is hanging from a spring of spring constant $1\, N/m$. If Saroj pulls the mass down by $2\,m$. The work done by Saroj is......$J$

  • [AIIMS 2009]
  • A

    $1$

  • B

    $2$

  • C

    $3$

  • D

    $4$

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  • [AIEEE 2003]

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