A stone with a mass of 0.900 {\rm m} long. The string will break if its tension exceeds 50.0 {\rm N}.

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 50.0 {rm N}. The stone is whirled in a horizontal circle on a frictionless tabletop; the other end of the string remains fixed. Find the maximum speed the stone can attain without breaking the string.