A 2.00 kg ball is attached to the bottom end of a length of a string 0.60 m in lenght. The top end of the string is held stationary. The ball is released from rest with the string taut and horizontal (theta = 90.0 °). Find (a) speed of the ball as it swings through the lowest point (theta = 0 °) , and (b) the tension in the spring at that point.