[" 21.A particle of mass "m" is being ci...

[" 21.A particle of mass "m" is being circulated on a vertical circle of "],[" radius "r" .If the speed of particle at the highest point be "v" ,"],[" then "],[[" (a) "mg=(mv^(2))/(r)," (b) "mg>(mv^(2))/(r)],[" (c) "mg,<=(mv^(2))/(r)," (d) "mg>=(mv^(2))/(r)]]

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[" 21.A particle of mass "m" is being circulated on a vertical circle of "],[" radius "r" .If the speed of particle at the highest point be "v" ,"],[" then "],[[" (a) "mg=(mv^(2))/(r)," (b) "mg>(mv^(2))/(r)],[" (c) "mg,<=(mv^(2))/(r)," (d) "mg>=(mv^(2))/(r)]]

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