4. When a ball is thrown, the horizontal distance travelled, d, in metres, can be modelled by the equation 1 V , m . . . . . . . d = E 51112 9, where g = 9- 3 5 , v 15 the veloc1ty With Wthh the ball 15 thrown, in metres per second, and 615 the angle of elevation, in radians. If a ball is thrown at 10 m/s, what angle of elevation is required for the ball to travel 100 m? \"'5'\