1. The problem statement, all variables and given/known data For type 1, 2, or 3 projectiles, which of the following are constant? Dx, Dy, Vx, Vy 2. Relevant equations 3. The attempt at a solution I figure that the only one that is constant in all situations would be Vx because there is no acceleration in the x direction. Dx would change depending on the height of launch, so would dy, and Vy, would depend on height as well because of gravity. But am I interpreting 'constant' correctly. Vx is the only horizontal straight line in a graph vs time but others are straight just not horizontal. Basically, what does constant mean in physics in the context of this question?