A wrecking ball swings at the end of an 11.0 meter cable on a vertical circular arc. The crane operator manages to give the ball a speed of 5.30 m/s as the ball passes through the lowest point of its swing, and then gives the ball no further assistance. Air resistance and friction are negligible. Evaluate what speed vf does the ball have when the cable makes an angle of 17.0 degree with respect to the vertical?