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Q. A stone with a mass of 0.700- {rm kg} is attached to one end of a string 0.900- {rm m} long. The string will break if its tension exceeds 50-{rm N}. The stone is whirled in a horizontal circle on a frictionless tabletop; the other end of the string remains fixed. Find out the maximum speed the stone can attain without breaking the string.

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