10.8#2

Hi, I was wondering if the t is under the radical sign. It does not look like it on the problem.

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No it's not. That would look more like this:

And we haven't covered this in class yet, but the general idea is that the arc length is the integral of the speed, which we were discussing in class as the magnitude of the velocity: s = ||v||. It looks like you left out a few derivatives when you computed the speed.