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Bonjour,

Rappel formules :

Vitesse = Distance / Temps

Temps = Distance / Vitesse

Distance = Vitesse x Temps

Donc :

a. D = 70 x 5

D = 350 km.

b. V = 700/35

V = 20 km/h.

c. T = 400/8

T = 50 sec.

d. 2 min = 2 x 60 = 120 s

D = 25 x 120

D = 3 000 m.

e. 1,5 km = 1 500 m

T = 1 500/10

T = 150 s.

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Réponse :

Explications étape par étape

Bonjour

V = d/t

V : vitesse

d : distance

t : temps

V = 70 km/h

t = 5h

d = v x t = 70 x 5 = 350 km

d = 700 km

t = 35 h

V = d/t = 700/35 = 20 km/h

V = 8 m/s

D = 400 m

T = d/v = 400/8 = 50 s

V = 25 m/s

T = 2 min = 2 x 60 = 120 s

D = v x t = 25 x 120 = 3000 m

D = 200 m

T = 20 s

V = d/t = 200/20 = 10 m/s

V = 10 m/s

D = 1,5 km = 1,5 x 1000 = 1500 m

T = d/v = 1500/10 = 150 s