Doing the algebra
t = -0.51 s or 4.83 s. Which answer is the one we are looking for?
The negative answer (-0.51 s) would indicate that it hit the ground before we threw it. This is obviously not the answer we’re looking for. In fact, the equations do not apply before we threw the ball because there were other forces acting on the ball besides gravity!
Thus the correct time for the ball to hit is: t = 4.83 s.