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a=Vt-Vo/t
a=13-4/t
a=9/3
a= 3 m/s²
kecepatan pada t= 5 s
Vt=Vo+a.t
Vt=4 + 3.5
Vt= 19 m/s
percepatan pada saat t= 5 s
a=Vt-Vo/t
a=19-4/5
a=15/5
a= 3m/s²
Jawaban.B