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Questions on rectilinear motion in basic mechanics

I need help doing two calculus problems #11, and #13. Each one is 5 parts (a,b,c,d,e) I have attached 3 files a) class notes for rectilinear motion b) the assignment (only problems 11 and 13) and my initial work on #11. I understand how to calculate 11 a, b, c but I get stuck on d, e. Can you explain what is going on and do it like he did in the class notes for #11 and #13 only