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Projectile Motion, Vector Component Confusion

  1. Sep 30, 2009 #1
    1. The problem statement, all variables and given/known data

    Canon fired at 45Degrees, at 300m/s
    Assuming no air resistance,
    a= -9.8m/s^2
    ViX = 300cos45 = 212m/s
    ViY = 300sin45 - 212m/s
    Displacement = 2293m [used vf^2=vi^2+2a(d)] rearranged for d, and vf=0, at highest peak.

    Time the ball is in the air= ?

    2. Relevant equations

    Thinking I have to use this, but this is where my math skills are rusty.

    dy = vi (t) + 1/2 a(t)^2

    3. The attempt at a solution

    time = -1038
  2. jcsd
  3. Sep 30, 2009 #2


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    Homework Helper

    You noted that Vy = 0 at half time.
    So you can use Vy = Viy + at to find the half time. Viy = 212
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