Question

a soccer ball kicked on a level field has an initial verticaly velocity of 15 m/s. assuming the ball lands at the same height from which it was kicked, what is the total time the ball is in the air?

Answer 1

since, the ball lands at same height, total height ascended, h=0
we have \(h=ut-\frac{1}{2}gt^2\)
Here h=0
u=15 m/sec
g =9.8 m/s^2
replace these values in the above relation and calculate t. That will be your answer.