Répondre :

80km=80 000m

1h=3600s

v=80000/3600=200/9 m/s

Fabrice

80km/h en m/s c'est :

 

1km = 1x1000m

donc 80km = 80x1000 = 80000m

 

1h = 60min = 60x60s = 3600s

 

donc 80km/h = 80000/3600m/s = 800/36m/s = 200/9 m/s = 22,2222222222..m/s

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