2. A ball attached to the end of a string is spun in a vertical circle. If the mass of the ball is 0.3 kg and the string has a length of 0.5 m, calculate the, a. minimum speed the ball must have at the top of the circle in order to continue the circular motion, the minimum speed the ball must have at the bottom of the circle in order to continue the circular motion, the force of tension in the string when the ball is at the top of the loop, and the force of tension in the string when the ball is at the bottom of the loop