Jawabanmu

2014-03-03T20:48:10+07:00
72 km/jam = 72000m/jam
                = 72000/3600 m/s = 20 m/s
2014-03-03T20:48:25+07:00
Satuan si = m/s
72 km/jam = ..... m/s
72.1000/1.3600
72000/3600 = 20 m/s