Question

Un automobil in 3 minute parcurge 5 km.De gasit viteza in sistemul si

Answer 1

viteza = spatiu /timp  in SI, viteza se exprima in metri/secunda

deci 5 km = 5000 m  si 3 minute = 3 x 60 = 180 secunde

v = 5000/180 = 27,77 m/s

Answer 2

$t=3 \ min=180 \ sec \\ d=5 \ km=5000 \ m \\ \bold{v-?} \\ Rezolvare: \\ \bold{v= \frac{d}{t} } \\ \Rightarrow v= \frac{5000 \ m}{180 \ sec} \\ \Rightarrow \boxed{v=27,(7) \ m/s}.$