Afootball is kicked from ground level with an initial vertical velocity of 48 ft/s. how long is the ball in the air?

a.3 s
b.5 s
c.8 s
d.10s

The time it will take for the velocity of the ball to be zero m/s is calculated below,
                                    Vf  = Vi - gt
where g is acceleration due to gravity which is equal to 32.2 ft/s². Substituting the known values,
                                       0 = 48 ft/s - (32.2 ft/s²)(t)
The value of t is 1.49 s. The total number of the ball in air is twice this value. Therefore, the ball spent 3 s in air. The answer is letter A. 

Dis the solution here