A5.59 kg ball is attached to the top of a vertical pole with a 2.11 m length of massless string. the ball is struck, causing it to revolve around the pole at a speed of 4.97 m/s in a horizontal circle with the string remaining taut. calculate the angle, between 0° and 90°, that the string makes with the pole. take g=9.81 m/s2.