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![[Post New]](/templates/default/images/icon_minipost_new.gif) 13 Feb 2008 21:20:41 IST
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feel the ans is a
when v is vertical the string is horizontal
g acts downwards
and the v is sqrt(3rg) by work energy theo
so a centripetal acc v(square)/r is applied ==3g
so by pythagoras net is g(sqrt(10))
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