1. The problem statement, all variables and given/known data A 120 g ball on a 60 cm long string is swung in a vertical circle about a point 200 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 of 650 cm above the floor. What was the tension in the string an instant before it broke? 2. Relevant equations Vf^2-Vi^2=2aS 3. The attempt at a solution I used the above equation to find the intial velocity when it breaks away from the string. Here's how I set that up: (0)^2-(Vi)^2=2(-9.8)(.45) This yielded: Vi= 2.969 m/s Now my problem is how do I use this velocity to find the tension of the string just before it breaks?