18.A particle of mass m is attached to a disc of equal mass m by means of a slack string as shown.The disc is hinged about its centre C on a horizontal smooth table.The particle  is thrown on the horizontal table with initial velocity v.Find its velocity , when the string becomes taut.

1)  V

2) V 3
3) 2 V 3
4) 3 V 4

  • -2
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