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Homework Help: Trebuchet help

  1. Jun 29, 2009 #1
    Trebuchet help!!!

    1. Hi, Im writing a report for a trebuchet project, and trying to find the final velocity of the tennis ball, my teacher told us to just use this :F=m(v^2/r) for initial velocity. so I am really confused right now. I don't know how to find final velocity. Also, which equation do I use for acceleration? A=change in v/ total time; or v^2/t ? /I will just post one set of data.: Range: 7.3m; time :.98s; initial velocity: 5.981m/s.

    Please Help..Its Due Tomorrow..AND Im STUCK on this..=[....
    THANK U !
    Last edited: Jun 29, 2009
  2. jcsd
  3. Jun 30, 2009 #2


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    Homework Helper

    Welcome to PF!

    Hi elvalil! Welcome to PF! :wink:

    Yes, your teacher is right, because the initial and final velocities will be the same (if we ignore air resistance), provided the trebuchet is at the same height as the target. :smile:

    (and if it isn't, just use KE + PE = constant :wink:)
  4. Jun 30, 2009 #3
    Re: Trebuchet help!!!

    Thank you!
    haha ..it was due today..
    so I got my grade already...

    but oh well..
    thanks anyways...
    now that I understand it completely.
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