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Homework Help: Projectile motion equation help!

  1. Feb 9, 2012 #1
    1. The problem statement, all variables and given/known data
    Using these two equations of (1) Dx=(Vox)t and (2) Dy= -(1/2)gt^2 I have to find an expression of Dy as a function of Dx

    Vox = initial component of velocity at time =0
    Dx = Distance traveled horizontally
    Dy= Distance traveled vertically upward

    2. Relevant equations
    Dx=(Vox)t and Dy= -(1/2)gt^2

    3. The attempt at a solution
    I rearranged equation (1) to get time; t=Dx/Vox and used this in equation (2) to substitute for t and coming up with the equation Dy = -g(Dx^2/Vox^2/2. I'm not quite sure I did this right any help would be appreciated.

    Thanks in advance!
  2. jcsd
  3. Feb 9, 2012 #2


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    Hello Jeffeff. Welcome to PF !

    You have unbalanced parentheses. Assuming you mean that Dy = -g(Dx2/V0x2)/2, that's correct.
    Last edited: Feb 9, 2012
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