Please see attached image for the full scope of the problem, and to see the work drawn out by the text.
My question lies with line 3 as it is clear that u-substitution was used on a definite integral, but the limits of integration were not changed.
The Attempt at a Solution
I think that line 3 should read:
My reasoning is that when t=0, u=0 and when t=10, u=0.2
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