Help with projectile motion

  • Thread starter helpme2012
  • Start date
  • #1
11
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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:

Answers and Replies

  • #2
70
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You could start with speed= distance /time.
Then think about components of velocity.
 
  • #3
11
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I honestly have no idea what I'm doing on this question. I'm completely lost.
 
  • #4
70
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Horizontally the ball moves 165.5m in 8.3s. What is the horizontal speed?
 
  • #6
70
0


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.
 
  • #7
11
0


24.99 degrees, rounded off to 25 degrees.
 
  • #8
70
0


Yep that's the right answer. That is all that was needed.
 
  • #9
11
0


Hah, I got that before when playing around with Δdχ= VixΔt
You're awesome, I'm an idiot lol. Thanks :)
 
  • #10
HallsofIvy
Science Advisor
Homework Helper
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Why did you erase the question? This thread might have helped other people.
 
  • #11
Evo
Mentor
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Why did you erase the question? This thread might have helped other people.
I fixed it.
 

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