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t = 0 s → ω(0) = 4(0) + 4 = 4 s
t = 5 s → ω(5) = 4(5) + 4 = 24 s
α rata-rata = Δω / Δt
= (ω₂ - ω₁) / (t₂ - t₁)
= (24 - 4) / (5 - 0)
= 4 rad/s²