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Math Help - Quadratic Equations and kinetics

  1. #1
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    Quadratic Equations and kinetics

    I think this is the right section to post this but im not 100%

    Find the time required for a train to reach 100m if Vo=20m/s (not sure how to do subext) and acceleration is .5m/s^2
     <br />
s=20t+(1/2).5t^2<br />
    As far as i know, this is solved using the quadratic formula. How would i go about putting this equation into quadratic form so i can use the quadratic formula?
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  2. #2
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    Quote Originally Posted by mode View Post
     <br />
s=20t+(1/2).5t^2<br />
    As far as i know, this is solved using the quadratic formula. How would i go about putting this equation into quadratic form so i can use the quadratic formula?
    make a = \frac{1}{2}\times 0.5 = 0.25 , b= 20 and c= 0
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  3. #3
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    would the 2nd number always be a? and would the first nuumber always be b?
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  4. #4
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    Quote Originally Posted by mode View Post
    would the 2nd number always be a? and would the first nuumber always be b?
    No, for at^2+bt+c = 0 , t= \frac{-b\pm\sqrt{b^2-4ac}}{2a}

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  5. #5
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    yea i do know i was just confused as to where the numbers would go in the quadratic form. But a little thinking has pulled me through but thanks for your help
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