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2D projectile motion problem

  1. Feb 18, 2013 #1
    1. The problem statement, all variables and given/known data
    A Projectile is launched from the top of a 100m tower and falls 20m below the bottom of the tower and 90m away in the x direction. Time of flight is 6 seconds.

    1. Find the x component of the velocity of the object when it strikes the ground.


    2. Find the y-component of the inital velocity of the object.


    2. Relevant equations
    I tried using Δx=Vi,x(t) to solve for the x component of Vf (since the inital should be the same as the final). Then I did the same thing for the y component of Vi.


    3. The attempt at a solution
    I got 15m/s for the x component of Vf and I'm not sure if this is correct. For the y component of Vi I solved and got 20m/s. I used -120m for Δy and i'm not sure if this is right because in the picture it shows the projectile going up a little before it begins to go down 120m.

    Any input would be greatly appreciated :smile:
     
  2. jcsd
  3. Feb 18, 2013 #2
    Yo I got 15m/s for x. My y was wrong sorry.
     
  4. Feb 18, 2013 #3

    tms

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    Don't forget that the y component of velocity is affected by gravity.
     
  5. Feb 18, 2013 #4
    What did you end up getting for the y?
     
  6. Feb 18, 2013 #5

    ehild

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    Homework Helper
    Gold Member

    How is the displacement along y related to the time of flight?

    ehild
     
  7. Feb 18, 2013 #6
    Yo i got this problem too. Is vy 9.43m/s?
     
  8. Feb 18, 2013 #7

    ehild

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    Excellent!

    ehild
     
  9. Feb 18, 2013 #8
    Awesome thanks!
     
  10. Feb 18, 2013 #9
    I got it. Wow, I don't know how I missed that. Maybe my brain was overloaded from studying all day and just farted. Thanks, though!
     
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