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Okay so first I set

100=-12+.444444444t

then 112=.444444444t

convert 112 to m/s

31.1111111=.4444444444t

t=70

then I use that time in

x=-3.333t+(1/2)(.44444444)t^2

and solve for x right? and I get

855.57m as the length of the runway but this is incorrect so where exactly is my mistake?