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V2 = 100 m/s
t = 1 menit = 60 s
a = 20 m/s
dit : V1 ?
dijawab :
a = (V2-V1)/t
20 = (100-V1)/60
20x60 = 100-V1
1.200 = 100 - V1
V1 = 100 - 1.200
V1 = -1.100 m/s