Engr. Moncada is playing tennis. She hit the ball into the air at a certain height in meters given by the equation h(t)=-24t^2+120t, where t is the number of seconds elapsed since the ball was hit....

Engr. Moncada is playing tennis. She hit the ball into the air at a certain height in meters given by the equation h(t)=-24t^2+120t, where t is the number of seconds elapsed since the ball was hit. How long does it take for the ball to hit the ground?