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Homework Help: Projectile proof

  1. Oct 20, 2007 #1
    1. The problem statement, all variables and given/known data
    Prove that a gun will shoot three times as high wehn its angle of elevation is 60deg as when it is 30deg but will carry the same horizontal distance.

    2. Relevant equations
    s=(Vo +Vf)/2 * t
    x=Vo*costheta *t

    3. The attempt at a solution

    AFter simplifying the equation i get:


    is this correct?
  2. jcsd
  3. Oct 21, 2007 #2


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    Homework Helper

    The equations are right but you haven't shown that the range of the two angles are the same... or the height at 60 is 3 times the height at 30.

    you've related the range to the height for each situation... but you haven't related range to range.. and height to height.
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