The range of a projectile fired at an angle with the horizontal and with an initial velocity of vo feet per second is r = 32V0² sin(20) where r is the horizontal distance (in feet) the projectile travels. An athlete throws a javelin at 75 feet per second. At what angle must the athlete throw the javelin so that the javelin travels 115 feet? (Assume 0 < 45°. Round your answer to two decimal places.) 0 =