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Homework Help: Intitial velocity from given angle and distance

  1. Sep 24, 2009 #1
    1. An athlete executing a long jump leaves the ground at a 30° angle and travels 8.30 m.
    What was the takeoff speed?

    2. Relevant equations
    Just the kinematic equations and trig functions.

    3. The attempt at a solution
    I don't even know where to begin solving the problem. I've tried using half the distance as a measurement but that wasn't correct.
  2. jcsd
  3. Sep 24, 2009 #2
    whats the height of the athete as a function of time after he takes of?

    at what value of t does this height become zero again?

    how much has the athlete traveled in that time.

    (of course an athlete is a point mass in this kind of problem)
  4. Sep 24, 2009 #3
    there is no height given, so I assume we ignore the height. The athlete has traveled 8.30m (no time given) and we ignore air resistance and his height.
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