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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 Apr 2008 18:56:49 IST
Accepted Answer [?]
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the radius is l and not 2l
now to complete a full circle the block must have enough energy to reach the topmost point
so 1/2mv^2 = mg(2l) (distance of topmost and initial bottommost point is 2l)
=> v = 2root(gl)
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"Imagination is more important than knowledge."
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this reply: 5 points
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