# Help with projectile motion

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

Last edited by a moderator:

Then think about components of velocity.

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

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

19.94m/s

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.

24.99 degrees, rounded off to 25 degrees.

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

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

HallsofIvy
Homework Helper

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

Evo
Mentor

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