A soccer ball is kicked with a speed of 18.0 m/s at an angle of 30.0 ∘ above the horizontal. If the ball lands at the same level from which it was kicked, for what amount of time was it in the air?
time of flight = 2u sin a / g
where u = initial velocity
a = angle of projection
g = acceleration due to gravity
t = 2*18*sin 30 / 9.8
= 1.84 s
so the ball remains for 1.84 s in the air
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