$A$ 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
$3\, m/s$
$2.5\, m/s$
$5/3\, m/s$
$10/3\, m/s$
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Difference between rigid body and solid body.