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1 jam = 3600 s
1) 2 km/jam = 2000 /3600 = 5/9 m/s
2) 54 km/jam = 54000 / 3600 = 15 m/s
3) 90 km/jam = 90000 /3600 = 25 m/s
Semoga jawaban cukup membantu .. boleh dong minta bintangnya ? :)