[tex]V = Vo + a.t
[/tex]
The ball is against the vector of gravity. Then, the gravity will be negative.
[tex]0 = 46,3 + (-9.8).t \\
t = \frac{46.3}{9.8} \\
t \approx 4.72
[/tex]
The ball will stop in the air after approx. 4.72 seconds. And will take the same time to hit the ground.
It will stay approx. 9.44 seconds in the air.
