Qualification > Math

FP1 DOUBTS HERE!!!!

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astarmathsandphysics:
its in the ms

Hwa1:
Just stupidity on my part, worked it out and it was pretty easy...I looked at the ms before but didn't get what it was doing, all is well now though :)
Just for part C, it's clear that you have to differentiate because it asked for a minimum value :P But I don't see why you'd actually do it in the first place =/  (What's the theory behind it?)
Thanks in advance

astarmathsandphysics:
as soon as you find x(t) differentiate to find a minimum in the usual way

Hwa1:
I understand what to do but I don't know why.
Doesnt differentiating have stuff to do with gradients and things rather than distances?

astarmathsandphysics:
Differentiate whenever you want to find a max or min

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