$A$ block of mass $m$ is attached to a pulley disc of equal mass $m$, radius $r$ by means of a slack string as shown. The pulley is hinged about its centre on a horizontal table and the block is projected with an initial velocity of $5\, m/s$. Its velocity when the string becomes taut will be

806-509

  • A

    $3\, m/s$

  • B

    $2.5\, m/s$

  • C

    $5/3\, m/s$

  • D

    $10/3\, m/s$

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