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Help with projectile motion

  1. Jan 21, 2013 #1
    Help with projectile motion :(

    1. The problem statement, all variables and given/known data
    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. Relevant equations
    No idea :(

    3. The attempt at a solution
    I don't even know where to begin
     
    Last edited by a moderator: Jan 21, 2013
  2. jcsd
  3. Jan 21, 2013 #2
    Re: Help with projectile motion :(

    You could start with speed= distance /time.
    Then think about components of velocity.
     
  4. Jan 21, 2013 #3
    Re: Help with projectile motion :(

    I honestly have no idea what I'm doing on this question. I'm completely lost.
     
  5. Jan 21, 2013 #4
    Re: Help with projectile motion :(

    Horizontally the ball moves 165.5m in 8.3s. What is the horizontal speed?
     
  6. Jan 21, 2013 #5
    Re: Help with projectile motion :(

    19.94m/s
     
  7. Jan 21, 2013 #6
    Re: Help with projectile motion :(

    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.
     
  8. Jan 21, 2013 #7
    Re: Help with projectile motion :(

    24.99 degrees, rounded off to 25 degrees.
     
  9. Jan 21, 2013 #8
    Re: Help with projectile motion :(

    Yep that's the right answer. That is all that was needed.
     
  10. Jan 21, 2013 #9
    Re: Help with projectile motion :(

    Hah, I got that before when playing around with Δdχ= VixΔt
    You're awesome, I'm an idiot lol. Thanks :)
     
  11. Jan 21, 2013 #10

    HallsofIvy

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    Staff Emeritus
    Science Advisor

    Re: Help with projectile motion :(

    Why did you erase the question? This thread might have helped other people.
     
  12. Jan 21, 2013 #11

    Evo

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    Staff: Mentor

    Re: Help with projectile motion :(

    I fixed it.
     
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