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[" 21.The velocity of a body revolving i...

[" 21.The velocity of a body revolving in a vertical circle of radius ' "r" " at the lowest "],[" point "sqrt(7gr)" .The radius of maximum to minimum tensions in the string is "],[[" A) "8:1," B) "4:1," C) "sqrt(7):1," D) "1:sqrt(7)]]

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