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Homework Help: Equations for projectile motion

  1. Mar 13, 2006 #1

    I'm having trouble figuring this one out..based on an angular momentum lab.

    In the lab we had a turntable with a ball on it, when the ball was released, the intial velocity could be calculated using the formula


    I need to be able to derive the same formula


    using only measureable quantites from my lab.

    measure quantities are

    height (ball to table top)
    mass of the ball
    distance between axis of rotation and ball
    distance horizontal distance

    I have to derive this equation using horizontal and vertical coordinates.

    any ideas?
  2. jcsd
  3. Mar 14, 2006 #2
    Well, it's motion with constant acceleration. You know how far it fell (vertically) so you should be able to calculate the time it took to fall. Then you know it moved horizontally with constant speed, and you know how far it went and (from the vertical equation) how long it was in the air.

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