# Projectile Motion- deriving formulas

1. Jun 15, 2011

### Haie101

1. The problem statement, all variables and given/known data

I need to know how the equation Dx= Vx$\sqrt{}2(Dy)$/a is valid.

2. Jun 15, 2011

### ojs

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).