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Projectile Motion in 2D

  1. Oct 21, 2008 #1
    A cannon ball is fired horizontally at a speed of 1000.0m/s from a height of 200.0m

    a.) How long does it take for the ball to land?
    b.) Where does it land?
    c.) What is its velocity when it lands?

    I get the a and b part....but i just don't understand what am i supposed to do with c.)

    Thx for helping =]
  2. jcsd
  3. Oct 21, 2008 #2
    You can use constatnt acceleration formulae to calculate the y velocity and the x velocity as it lands seperately.
    Because the y and x axes are perpendicular to each other, you are able to use pythagoras' theorem to calculate the total velocity (the hypotenuse in this case).
  4. Oct 21, 2008 #3
    oh....i am having trouble finding the vertical velocity too.....
  5. Oct 21, 2008 #4
    initial vertical velocity = 0ms-1, because it is only fired horizontally (no vertical components).
    height = 200m
    acceleration = -9.81ms-2

    we can use the constant acceleration formulae: vf^2 = vi^2 + 2as --> Where s is displacement.
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