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Homework Help: Projectile Motion: Clearing a Fence?

  1. Sep 24, 2012 #1
    1. The problem statement, all variables and given/known data
    A ball is batted with a velocity of 30 m/s at an angle of 30 degrees above the horizontal from a height of 1.0 m above the ground. Will the ball clear a 2.5 m high fence which is 30 m away? By how much will it miss or clear?

    2. Relevant equations
    ballistic path equation? delta y = (-gx^2/(2v)^2*(cos @)^2) + xtan@
    @ = angle

    3. The attempt at a solution
    I used the ballistic path equation, and set the delta y = 1.5. On the other side i plugged in the 30 for x, 30 degrees for @, and vi as 30m/s.

    I got clear by 12.5m, but I don't think that is right.
    How to do you do this problem?
  2. jcsd
  3. Sep 24, 2012 #2


    User Avatar

    Staff: Mentor

    Your result doesn't look right. You'll have to present more of your attempt so we can see how to help.
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