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r maks itu syaratnya dr/dt = 0
15 - 10t = 0 ---> t = 1,5 sekon.
r maks = (20(1,5))i + (15(1,5) - 5(1,5)^2)j
r maks = 30i + 11,25j ----> r max = (X maks) i + (Y maks) j
jadi, titik tertinggi pada saat Y = 11,25 m