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a= 20m/s - 0 / 30 - 0
a=20m/s / 30 s
a= 0,666666667
Vo = 0 m/s
Vt = 72 km/jam = 20 m/s
t = 30 sekon
a = percepatan =?
a = (Vt = Vo) / t
a = ( 20 - 0) / 30 s
a = 0,67 m/s
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