Projectile Motion- deriving formulas

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Haie101
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Homework Statement



I need to know how the equation Dx= Vx[itex]\sqrt{}2(Dy)[/itex]/a is valid.
 
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Well, then we need to know the context of the problem. What are the variables here? What is Dx, Vx, Dy and a (I assume a is acceleration but the rest, no idea).
 

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