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Homework Help: Projectile motion different heights

  1. Feb 4, 2010 #1
    1. The problem statement, all variables and given/known data
    slingshot (at ground level) a balloon through a window that is at height h above the ground. kids are at max range away from window, neglecting air resistance show that d=R/2 (1 + sqrt(1-4h/R)) is the distance of the slingshot from the window

    2. Relevant equations
    Rmax = V[o]^2 / g also r= 4h

    3. The attempt at a solution
    the hint given by professor is to use the trajectory equation, we know that theta = pi/4 at max range, and that distance is v^2=Vnaught^2 + 2a(x-xnaught) but im not sure if this is the right ones to use and if so then is V^2 = 0?

    any suggestions would be great,
  2. jcsd
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