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Vt = 20 m/s
s = 70 m
Vt² = Vo² + 2as
20² = 6² + 2 . a . 70
400 = 36 + 140a
140a = 400 - 36
140a = 364
a = 364 : 140
a = 2,6 m/s²
Vt = Vo + at
20 = 6 + 2,6t
2,6t = 20 - 6
2,6t = 14
t = 14 : 2,6
t = 5,38 s