Which variables are constant in different types of projectile motion?

[avsj]

Homework Statement

For type 1, 2, or 3 projectiles, which of the following are constant?

Dx, Dy, Vx, Vy

Homework Equations

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?

 

[Kurdt]

What are type 1, 2 and 3 projectiles? What are the quantities you have listed? Presumably Vx and Vy are velocity in the x and y directions respectively. Are the D's distance?

 

[avsj]

Type 1- horizontal launch off cliff
Type 2 - angled launch landing at same height as launch
Type 2 - angled launch landing at different height as launch

D is displacement
And V is velocity and x and y are the horizontal and vertical components respectively.