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Homework Help: Projectile is fired over level ground

  1. May 10, 2016 #1
    1. The problem statement, all variables and given/known data
    A projectile is fired over level ground with an initial velocity that has a vertical component of 20 m/s and a horizontal component of 30 m/s. Using g = 10 m/s2, the distance from launching to landing points is:

    2. Relevant equations
    Vi(t) +0.5at^2

    3. The attempt at a solution
    I used the first equation to solve for the time it took from start to finish. 0=20m/s(t)+0.5(-10m/s2)t^2 and that gave me 4 seconds to launch and land.

    Next i used the same equation only now i used the x component so x=30m/s(4s) and the displacement was 120 meters.

    Any errors you see?
  2. jcsd
  3. May 10, 2016 #2
    I'm guessing you made a typo in your relevant equations...
  4. May 10, 2016 #3
    What do you mean?
  5. May 10, 2016 #4


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    Staff Emeritus
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    Looks good to me !

    I like the analysis.
  6. May 10, 2016 #5
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