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d=56 km
delta t =45 min

v=?m/s


Răspuns :

V = 5600:(45×60) = 5600 : 2700

V = 2m/s

56 km=56000 m

45 min=2700 S

v=d/t=>v=56000/2700

v=560/27

v=20,7 m/s.