Question

Un automobil cu masa m=2300kg se deplaseaza pe un drum orizontal cu viteza de 180km/h.Calculati energia cinetica a automobilului..

Answer 1

$m=2 \ 300 \ kg \\ v=180 km/h=50 \ m/s \\ E_c=\frac{m \cdot v^2}{2}=\frac{2 \ 300 \ kg \cdot (50 \ m/s)^2}{2}=1 \ 150 \ kg \cdot 2 \ 500 \ (m/s)^2=2 \ 87 5 \ 000 \ J \\ \Rightarrow \boxed{\bold{E_c=2,875 \ MJ}}$

Answer 2

Se da:
m=2300kg
v=180km/h=50m/s
Ec=?

Formule:
Ec=m*v^2/2

Calcule:
Ec=2300*50^2/2=2875kJ