Réponses

2013-04-03T18:56:52+02:00
- 1 km= 1000 m
1h = 60 s

- 7.5m/s = 450m/h = 0,45km/h
- 12 m/s = 720 m/h = 0,72 km/h
- 1200m/s = 72000m/h = 72 km/h
- environ 1666,6 m/s 100000 m/h = 100 km/h