I can only think they mean the average velocity during the 1st 3 seconds.
So, get the displacement and divide by the time for average velocity over the interval.
Using the equation x(t)= t^3 - 12t + 1, find the displacement during the first 3 seconds. And then find the velocity during the first 3 seconds.
See, I know how to find velocity, but there's a question after that that says to find velocity when t=3...so how do you find it DURING the 3 seconds?
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