Question

Ce energie cinetica are un peste cu masa 20g care se deplaseaza cu viteza de 40 m/s ?

URGENT !!!

Answer 1

$m=20 \ g=0,02 \ kg \\ v=40 \ m/s \\ \boxed{E_c-?} \\ \bold{Rezolvare:} \\ \boxed{E_c=\frac{m \cdot v^2}{2}} \\ E_c=\frac{0,02 \ kg \cdot (40 \ m/s)^2}{2} \\ E_c=\frac{0,02 \ kg\cdot \ 1 \ 600 }{2}=\frac{32 \ J}{2} \\ \Rightarrow \boxed{E_c=16 \ J}$