Jawabanmu

2014-06-05T07:26:26+07:00
S(t) = -1/3 t³+3t² - 5t
S'(t) = 0
-t² + 6t - 5 = 0
t²-6t+5=0
(t-1)(t-5) = 0
t=1⇒S(1) = -1/3 + 3 - 5 = -7/3
t=5⇒S(5) = -125/3 + 225/3 - 45/3 = 55/3
saat bola mencapai tinggi maksimum adalah t = 5

f(x) =   x - 3           
         x² - 7x + 12
f(3) = (3-3)/(3²-7(3) + 12) = 0