1. When a ball is thrown, the horizontal distance travelled, d, in meters, can be modelled by the equation 12 d = cos30 g Where g = 9.8 m/s' I' is the initial velocity with which the ball is thrown, in meters per second O is the launch angle of elevation, in radians. If the ball is thrown at 20 m/s what is the angle of elevation is required for the ball to travel 20 m? Round your answer to the nearest hundredth of a radian