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Max Height of a Projectile

  1. Jun 9, 2009 #1
    1. The problem statement, all variables and given/known data
    Find the max height of a projectile fired at an angle of 30 degrees if it's inital speed is 0.714m/s.
    (this is a lab so I have other data that might be needed)
    2. Relevant equations
    V22=V12+2ad

    3. The attempt at a solution
    V22=V12+2ad
    0=(0.714sin30o)2+2(-9.81)(d)
    d=19.62-0.127449
    d=19.49m

    Now this answer is not practical at all. There is no way my projectile went that high. Maybe a couple meters, but not 19.5m. Where did I go wrong?
     
  2. jcsd
  3. Jun 9, 2009 #2

    LowlyPion

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    Homework Helper

    Maybe it's your math that isn't practical?

    Shouldn't you get a result that is a small number divided by a big number?
     
  4. Jun 9, 2009 #3

    rock.freak667

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    Homework Helper

    If v2=0

    then 0=V12-2(9.81)d

    [tex]d=\frac{V_1^2}{2(9.81)}[/tex]
     
  5. Jun 9, 2009 #4
    wow, it is way to late. How did I mess that up.
     
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