On the centre of a frictionless table a small hole is made, through which a weightless string of...

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On the centre of a frictionless table a small hole is made, through which a weightless string of length 21 is inserted. On the two ends of the string two balls of the same mass \( m \) are attached. Arrangement is made in such a way that half of the string is on the table top and half is hanging below. The ball on the table top is made to move in a circular path with a constant speed \( v \). What is the centripetal acceleration of the moving ball
[DUMET 2009]
(a) mul
(b) \( g \)
(c) Zero
(d) \( 2 m v l \)
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