Jawabanmu

2014-08-10T11:12:23+07:00
Km ke m turun 3 tangga kan? jadi kali 1000
jam ke detik kali 3600

72km/jam x 1000/3600 = 72000/3600= 20m/s
2014-08-10T11:12:54+07:00
72km...... 72000m
jam... 3600s

72000m:3600s= 20