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jenis Gerak B= GLBB----> a= V/t=12/3= 4 m/s²
S(A)=S(B)
V.t=1/2.a.t²
12.t-1/2.4.t²=0
12t-2t²=0
t(2t-12)=0
t=0 atau t= 6 s
jadi mobil B akan menyusul mobil A pada waktu 6 sekon