Two plates each of mass $m$ are connected by a massless spring as shown below. A weight $w$ is put on the upper plate which compresses the spring further. When $w$ is removed, the entire assembly jumps up. The minimum weight $w$ needed for the assembly to jump up when the weight is removed is just more than ...........$ \,m$

210572-q

  • [KVPY 2011]
  • A

    $1$

  • B

    $2$

  • C

    $3$

  • D

    $4$

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  • [AIEEE 2007]