Vul de ontbrekende gegevens in. afstand tijd gemiddelde snelheid 45 km 45 minuten km/h 4,5 km 80 minuten m/s 200 m s 9,0 m/s km 2 uur 85 km/h 20 km minuten 90 km/h

Antwoord:

60 km / uur; 0,9375 m / s; 22.222; 170 km; 13.333 minuten

Uitleg:

Gegeven:

Afstand ___ tijd ___ gemiddelde snelheid

45 km __45 minuten ___ km / u

4,5 km __80 minuten __m / s

200 m ___s 9,0 m / s

km 2 uur 85 km / u

20 km_ minuten ___90 km / u

De relatie gebruiken:

Gemiddelde snelheid (s) = afstand (d) / tijd (t)

A.)

d = 45 km; t = 45 minuten = 45/60 = 0,75 uur

s = 45 / 0,75

s = 60 km / uur

B.)

d = 4,5 km = (4,5 * 1000) = 4500 m

t = 80 * 60 = 4800 s

s = 4500/4800 = 0,9375 m / s

C.)

d = 200 m; s = 9 m / s

t = 200/9 = 22,222 s

D.)

d = s * t

d = 85 * 2 = 170 km

E.)

t = d / s

t = 20/90

t = 0,22222 uur = 13,333 minuten

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