Which variables are constant in different types of projectile motion?

AI Thread Summary
In projectile motion, the only constant variable across all types is Vx, the horizontal velocity, due to the absence of acceleration in the x-direction. Dx and Dy, representing horizontal and vertical displacement, respectively, vary based on launch height and trajectory. Vy, the vertical velocity, also changes with height due to gravitational acceleration. The discussion clarifies that 'constant' refers to values that do not change throughout the motion. Understanding these concepts is crucial for analyzing different projectile types, including horizontal launches and angled launches at varying heights.
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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?
 
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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?
 
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.
 
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