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Constants in Projectiles

  1. Jul 13, 2007 #1
    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?
  2. jcsd
  3. Jul 13, 2007 #2


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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?
  4. Jul 13, 2007 #3
    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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