Pourrais t’on m’aider svp ?

Bonjour,

E = 1/2 × m × v^2

0.5 = 1/2 × 0.0002(kg)×v^2(m/s)

0.5 = 0.0001 ×v^2

V^2 = 0.5/0.0001

V^2 = 5000

V = racine de 5000

V ~71m/s

71 × 3.6 ~255 km/h