Question

The place kicker on a football team kicks a ball from ground level with an initial speed of 8.30 m/s at an angle of 19.0° above the horizontal. How long is the ball in the air before it lands on the ground again? You may neglect air resistance.

Answer 1

in the vertical:
hf=hi+vi*t-1/2 g t^2
0=0+8.3sin19*t-4.8t^2
0=t(8.3sin19-4.8t)
t=8.3sin19/4.8 seconds

Answer 2

.57