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The question is a three part question. Part a) asked to find the average velocity with the equation $y= -\frac{1}{25}x^2 + \frac{4}{5}x$ on the interval $[6,10]$. Part b) asked to find the instantaneous velocity at $x=6$ and $x=10$. Part c) asks to find the acceleration at $x=4$. So I am not sure what to do after part b).

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    Isn't this question not well posed? The interval of definition is [6,10] and the request is to find the acceleration at $x=4$.2012-10-14
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    It says to find the average velocity on that interval --- it doesn't say the function is defined only on that interval.2012-10-15

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