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Homework Help: Velocity Problem

  1. Feb 1, 2007 #1
    1. The problem statement, all variables and given/known data

    The position of a car is given by the values below.

    Seconds | Feet
    1 | 10
    2 | 32
    3 | 70
    4 | 119
    5 | 178

    Find the average velocity for the time period beginning when t=2 and lasting
    (a) 3 seconds
    (b) 2 seconds
    (c) 1 second

    2. Relevant equations

    There were no equations provided

    3. The attempt at a solution

    i usually have an equation to go by, but i do not in this case.
    all attempts to make an equation out of the data have failed.
    i think it is an exponential curve, but i can find the exact formula.
    if anyone could stear me in the direction so i can figure this problem out.
    i want to know what i'm doing, so do not give me the answer but please someone point me in some productive direction.

    would i just input the numbers in the slope equation?
    i have the x and y already.
    that seems too easy.
  2. jcsd
  3. Feb 2, 2007 #2
    Last edited: Feb 2, 2007
  4. Feb 2, 2007 #3


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    Science Advisor

    xviddivxoggmp3, you are completely right- it is that easy. Shrodinger's dog is also correct but might be a bit confusing here. His point is that this problem is leading you to the idea of a "limit" and then the velocity at a single time.
  5. Feb 2, 2007 #4
    Yeah I edited, I kind of misread it, but then I reread his question and saw how simple what he was asking was.:smile:

    Here's a graph I did,I had a bit of time and wanted a bit of practice.

    Graph of:-

    Seconds | Feet
    1 | 10
    2 | 32
    3 | 70
    4 | 119
    5 | 178


    Essentially the question is asking you to find an exact point on the graph.
    Last edited: Feb 2, 2007
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