Bonsoir
36 m / s = 0.036 x 3 600 = 129.6 km / h
10.4 m / s = 0.0104 x 3 600 = 37.44 km / h
159.6 m /s = 0.1596 x 3 600 = 574.56 km/h
2 cm /s = 0.00002 x 3 600 = 0.072 km /h
fais le dernier, c'est pareil
