A football player kicks with a speed of 21 m/s at 37 degree to the horizontal. How long is the ball in the air?

Answer 1

initial speed up Vi = 21 sin 37

v = Vi - 9.81 t
at top v = 0
so
t = ( 21 sin 37 ) / 9.81 = time rising
time falling = time rising
so
2 t = time in air