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80^2 = vo^2 + 2.a.40
6400 = vo^2 + 80a
400 = vo.t + 1/2(a)(t^2)
400 = 8.vo + 32a
50=vo+4a
a=(50-vo)/4
6400=vo^2+80(50-vo)/4
6400=vo^2+1000-20vo
vo^2-20vo-6300=0
(vo-90)(vo+70)=0
vo=90 atau vo=-70