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Another rate of change

  1. Feb 2, 2013 #1
    1. The problem statement, all variables and given/known data
    A particle moves along the x-axis in such a way that its distance x cm from the origin after t
    t seconds is given by the formula x= 7t + 12t2. What distance does it travel in the nth second?

    Isn't it 7(n) + 12(n)2?
     
  2. jcsd
  3. Feb 2, 2013 #2

    rollingstein

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    Gold Member

    Nope.
     
  4. Feb 2, 2013 #3

    rollingstein

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    distance it travels in the nth second = x(n) - x(n-1)
     
  5. Feb 2, 2013 #4
    Oh ... thank you.
     
  6. Feb 2, 2013 #5
    n+1 would be the distance travelled in each second after?
     
  7. Feb 2, 2013 #6

    rollingstein

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    Show how? I doubt it.
     
  8. Feb 2, 2013 #7

    HallsofIvy

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    No! "n" is not a distance at all. "n" and so "n+1" are times not distances.
     
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