oblicz15km/h ale zamien na m/s oblicz 20m/s ale zamien na km/h oblicz 30m/s ale zamien na km/h

1 km = 1000 m 1 h = 3600 s 1 m = 0,001 km 1 s = 1/3600 h   15 km/h = 15*1000m/3600s = 4,166 m/s ≈ 4,2 m/s 20 m/s = 20*0,001km : 1/3600h = 72 km/h 30 m/s = 30*0,001km : 1/3600h = 108 km/h