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Math Help - Basic Physics Formula Uncertainty

  1. #1
    Junior Member masoug's Avatar
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    Basic Physics Formula Uncertainty

    Hi,
    I came across this formula d=rt-5rt^2, and when I used it to solve problems, I got ridiculous answers.

    I asked others and they suggested d=rt-5t^2, but I am not too sure about it.

    Can anyone help we clarify how this formula works? Is it the right formula?

    Thanks!

    -Masoug
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  2. #2
    Flow Master
    mr fantastic's Avatar
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    Quote Originally Posted by masoug View Post
    Hi,
    I came across this formula d=rt-5rt^2, and when I used it to solve problems, I got ridiculous answers.

    I asked others and they suggested d=rt-5t^2, but I am not too sure about it.

    Can anyone help we clarify how this formula works? Is it the right formula?

    Thanks!

    -Masoug
    Please post an example (exact wording) of the sort of question you are trying to solve by using this formula.

    (The formula is probably meant to be s = ut + \frac{1}{2} a t^2), which will be in your class notes and textbook.)
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  3. #3
    Junior Member masoug's Avatar
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    The question was in the context of trajectories, where we have to find the height of a baseball after impact from a bat. The question supplied the first equation and I get really weird answers.
    If an object is thrown into the air with an initial upward velocity of r, then its distance above its starting height at t seconds after it was thrown is approximately d=rt-5rt^2 meters. Homer Un, the famous baseball player hit a fly ball to the infield with an initial upward velocity of 30 meters per second.
    a. What is the height after 2 seconds?
    Any suggestions?

    Thanks!

    -Masoug
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  4. #4
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    Quote Originally Posted by masoug View Post
    The question was in the context of trajectories, where we have to find the height of a baseball after impact from a bat. The question supplied the first equation and I get really weird answers.


    Any suggestions?

    Thanks!

    -Masoug
    This question is now on my list of stupid questions. What book is it from? It's stupid because of the equation it gives.

    My advice is to use the formula I gave you in my first post. Substitute u = 30 m/s, a = -10 m/s^2, t = 2 and solve for s.
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