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- A ball on a string is swung in a vertical circle. The string has a length of 0.7m. The ball has a mass of 0.4kg and is traveling with a speed of 9.2m/s at the top of the circle. What is the tension in the string (in Newtons) when the ball is at the top of the circle? Your Answer: Question 3 options: Answer unitsThe 1.0 kg iron ball shown is being swung in a vertical circle at the end of a 1.0-m string. (a) How slowly can the ball go through its top position without having the string go slack? (b) Now, suppose the ball is moving at 5.0 m/s at the top position, what is the tension in the string?A 1.0 kg ball at the end of a 2.0 m string swings in a vertical plane. At its lowest point the ball is moving with a speed of 10 m/s.What is the tension, in newtons, in the string when the ball is at the top of its path?