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Question about projectile motion

  1. Feb 22, 2009 #1
    I have a question when any object is in project motion is the vertical acceleration of the object equal to 9.81m/s^2 (gravity)?
  2. jcsd
  3. Feb 22, 2009 #2


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    Yes - (ignoring air resistance) remember to get the signs right, it acts down!
  4. Feb 22, 2009 #3

    Doc Al

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    Yes. (Given the usual assumptions: Near the earth's surface; no air resistance.)
  5. Feb 22, 2009 #4
    I have another question what equations can I use to find intial v, the angle and maximum height on projectile motion?
  6. Feb 22, 2009 #5
    For initial V you only need:

    initial V = (X - initial X) / t

    For maximum height (you are asking for final y, where initial y=0, and initial V=0) :

    y = (4.9m/s^2) (t^2)

    Finally, angles are found using Pythagoras theorem or sen, cos, and tan famous equations. Review your trigonometry.
    Last edited: Feb 22, 2009
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