Question

un automobil ruleaza cu viteza constata de 72 k/h pe soseaua rectilinie. ce distanta parcurge automobilul in 10 s? cat timp trebuie automobilului pentru a parcurge 25 km??

Answer 1

v=72 km/h---->v=20m/s
t=10 s
d=?
d2=25 km---->d2=25.000m
t2=?
$v= \frac{d_{1}}{t_{1}} =\ \textgreater \ d_{1}=v*t_{1} =\ \textgreater \ d_{1}=20m/s*10 s=200 m=\ \textgreater \ d_{1}=200 m$
Punctul b)
$v= \frac{d_{2}}{t_{2}}=\ \textgreater \ t_{2}= \frac{d_{2}}{v} = \frac{25.000m}{20m/s} =1250 s =\ \textgreater \ t_{2}=1250s$