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Math Help - another calc problem.

  1. #1
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    another calc problem.

    This one I forgot to include with my previous question.

    A particle moves along a line so that its position at any time t≥0 is given by the function s(t)=tł-8t+1, where s is measured in feet and t is measured in seconds.

    Find the average velocity during the first 3 seconds, and at what values of t does the particle change direction?

    My answer for the average velocity is 5ft/s, and my answer for the second part is 1.60s and -1.60s.

    How close am I?
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  2. #2
    Moo
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    P(I'm here)=1/3, P(I'm there)=t+1/3
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    Hello,

    My answer for the average velocity is 5ft/s
    You forgot to divide by 3.

    =\frac{f(3)-f(0)}{3-0}


    and my answer for the second part is 1.60s and -1.60s.
    I find rather 1.63

    moreover, time cannot be negative, so you have to keep the positive solution only;
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