R = ks^2+m
1060 = (80*80)k+m
6400k+m = 1060 ........(i)
1460 = (120*120)k+m
14400k+m = 1460 .........(ii)
Solve i and ii simultaneously and get k and m.
At 140km/h,
R = (140*140)k+m
Substitute for k and m and get the resistance at 140km/h
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