Projectile Motion: Finding the Angle of Launch

[helpme2012]

Help with projectile motion :(

1. Homework Statement
A soccer ball is kicked from the roof of a 260m building. The ball is given an initial speed of 22m/s. It is airborne for a period of 8.3s and travels horizontally for 165.5m before hitting the ground. What is the angle ( in degrees) at which the soccer ball was kicked?


2. Homework Equations
No idea :(

3. The Attempt at a Solution
I don't even know where to begin

 

[apelling]

You could start with speed= distance /time.
Then think about components of velocity.

 

[helpme2012]

I honestly have no idea what I'm doing on this question. I'm completely lost.

 

[apelling]

Horizontally the ball moves 165.5m in 8.3s. What is the horizontal speed?

 

[helpme2012]

19.94m/s

 

[apelling]

19.94 is a component of the initial 22m/s.
Draw a right angled triangle with 22 on the hypotenuse, 19.94 on the adjacent side and work out the angle.

 

[helpme2012]

24.99 degrees, rounded off to 25 degrees.

 

[apelling]

Yep that's the right answer. That is all that was needed.

 

[helpme2012]

Hah, I got that before when playing around with Δdχ= VixΔt
You're awesome, I'm an idiot lol. Thanks :)

 

[HallsofIvy]

Why did you erase the question? This thread might have helped other people.

 

[Evo]

Why did you erase the question? This thread might have helped other people.

I fixed it.