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Verified answer
Materi : Turunans(t) = - ⅓t³ + 4t² - 12t
v(t) = ds(t)/dt
= d(-⅓t³ + 4t² - 12t) / dt
= -t² + 8t - 12
Kecepatan maks. didapat saat v'(t) = 0
=> -2t + 8 = 0
=> -2t = -8
=> t = 4 dtk
Jawaban : D