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LOL, i wrote about the full space and included more after... cus i didnt KNOW what they wanted for the full 8 marks, so i just included as mani points as possible? i figured 2 marks for definitions, what it means wot it dus etc.. and then 5 marks for waht happens and points like natural...

Mmmm, well this is wot i had, U cant find y''=0 for an inflexion point so, u draw the graph after expanding it out its a parabola and the steepest gradient (ie. fastest rate) is at the end point, t=0