A football 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.