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yes arnie, but if you read my post, i already stated this. the CG cannot always be kept vertical since nobady has a perfectly horzontal surface.. if they do, and the stick STILL falls, then surely the wind can be the only reason.
if a stick kept on perfectly horizontal plane in a vacuum and the stick is perfectly vertical, it has no reason to fall! (apart from fluctuations in the earth's rotation ;p)
shreyas
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