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Math Help - Finding the stopping distance using d=0.20v+0.15v^2.

  1. #1
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    Finding the stopping distance using d=0.20v+0.15v^2.

    The stopping distance, d in meters for a car traveling at v km/h is given by the formula d=0.20v+0.15v^2. Find the increase in stopping distance when v is increase by x km/h.

    I do not get this at all much help appreciated
    Thanks in advance
    Last edited by mr fantastic; September 7th 2011 at 07:49 PM. Reason: Re-titled.
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    Re: Need help math question

    Replace v with v+x.

    what do you get?
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    Re: Need help math question

    Quote Originally Posted by BobNeedsMuchHelp View Post
    The stopping distance, d in meters for a car traveling at v km/h is given by the formula d=0.20v+0.15v^2. Find the increase in stopping distance when v is increase by x km/h.
    d_{new}=0.20(v+x)+0.15(v+x)^2

    increase = (d new) - (d old)
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