A 200-g ball is whirled in a vertical circle of radius 1.0 m. At the instant when the string is horizontal, as in the diagram, the ball's speed is 10 m/s. While in this position, the tension in the string is equal to 10 m/s 1 m /1 mark a. 2.0 N b. 22 N c. 18 N d. 20 N e. zero