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kec setelah 12s = Vt = 80 m/s
percepatan a=(Vt-Vo)/t
= (80-50)/12
= 30/12
= 5/2 = 2,5 m/s²
a = (vt-v0) : t
a = (80 m/s-50 m/s) : 12 s
a = 30 m/s : 12 s
a = 15 : 6 m/s2
a = 5 : 2 m/s2
a= 2 1/2 m/s2
[a= 2,5 m/s2]