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Homework Help: Projectile problem

  1. Nov 24, 2007 #1
    Suppose that a projectile is fired at an angle of 45[tex]\circ[/tex] from the
    horizontal. Its initial position is the origin in the xy-plane, and its
    initial velocity is 100[tex]\sqrt{}2[/tex] ft / sec. Then its trajectory will be the part of
    the parabola y = x -( [tex]\frac{}{}x/[/tex]25)^2 for which y ≥ 0.
    a) How far does the projectile travel (horizontally) before it hits the
    ground?
    b) What is the maximum height above the ground that the
    projectile attains?
     
  2. jcsd
  3. Nov 25, 2007 #2

    Shooting Star

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    a) When it hits the ground again, what's the value of y?
    b) The highest point is at the vertex of the parabola. Do you know how to find the vertex from the given eqn?
     
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