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![[Post New]](/templates/default/images/icon_minipost_new.gif) 7 Feb 2008 13:30:44 IST
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hsbhatt angular momentum about the hinge is not conserved in this case as we are not talking about a gravity free space .even if the collision forces cancel out N and mg do not cancel out.when the block finally falls down on ly then N&Mg cancel out but at that instant  =0.L=0
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