Question

In cat timp strabate un automobil distanta de 15 km
daca se misca rectilinie uniforma cu viteza de 54 km/h

Answer 1

$d=15 \ km=15 \ 000 \ m \\ v=54 \ km/h=15 \ m/s \\ \boxed{t-?} \\ \bold{Rezolvare:} \\ \boxed{v= \frac{d}{t} } \\ \Rightarrow t= \frac{d}{v} } \\ t= \frac{15 \ 000 \ m}{15 \ m/s} \\ \Rightarrow \boxed{t=1 \ 000 \ s}.$

Answer 2

S=v*t si t=S/v
v=54km/h=15m/s
S=15km=15 000m
t=15 000/15=1000s
Succes!