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ω(kecepatan sudut) =dФ/dt=6t-1,2t^2
maksimum ketika, dω/dt=0
dω/dt=6-2,4t=0
t=6/2,4=2,5
ω maks = 6.2,5+1,2.2,5^2=15+7,5=22.5 rad/s
jadi kec maksnya 22,5 rad/s