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d=2 km
viteza=5m pe secunda
DT=?​


Răspuns :

v=d/t

t=d/v=2km/5m/s=2000/5 s=400 s

R:400 s

v=d/Dt=> Dt=d/v

d=2km=2000m

Dt=2000m÷5 m/s= 400s= 6 min si 40 secunde