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a.) 45 km / jam = 45 x 1000m/ 3600s = 45 / 3.6 = 12.5 m/s
b.) 20 m / s = 20 x 3600 / 1000 = 20 x 3.6 = 72 km/jam
yang lainnya caranya sama aja yaa... :)
2.
s = 32km t = 1jam
v = s/t = 32/1 km/jam = 32 km/jam = 8.89 m/s