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h(t) = 400t-5t²
h(t) = 400 - 10t
0 = 400 - 10t // pindah ruas
10t = 400
t = 400/10 = 40 <-- maka tinggi maksimu terjadi saat t=40
dan nilai ketinggian maksimunya adalah
h(t) = 400t - 5t²
h(t) = 400 (40) - 5 (40²)
= 16000 - 8000 = 8000 meter