A 100 {\rm g} ball on a 60 {\rm cm} long string is swung in a vertical circle whose center is 200 {\rm cm} above the floor.

A 100 {rm g} ball on a 60 {rm cm} long string is swung in a vertical circle whose center is 200 {rm cm} above the floor. The string suddenly breaks when it is parallel to the ground and the ball is moving upward. The ball reaches a height 600 {rm cm} above the floor.What was the tension in the string an instant before it broke?