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= 640/40
= 16 m/s
s = v₀.t + (1/2)a.t²
640 = 8.40 + (1/2)a.1600
640 = 320 + 800a
320 = 800a
a = 0,4 m/s²
v₁ = v₀ + a.t
v₁ = 8 + 0,4.40
v₁ = 8 + 16
v₁ = 24 m/s