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Tinggi maksimum dicapai ketika h'(t) = 0
h'(t) = 0
0 = 600 - 10t
10t = 600
t = 600/10
t = 60 sekon
tinggi maksimum roket dicapai saat t = 60 sekon
h(t) = 600t - 5t²
h(60) = 600(60) - 5(60)²
h(60) = 36000 - 18000
h(60) = 18000 meter
Jadi, tinggi maksimum yang dicapai roket adalah 18000 meter