Răspuns :
energia cinetica = masa x viteza² / 2
masa = Ec x 2 / v² = 2 x 1 j / 1 m²/ s²v= 2 j /m²/s² = 2 kg
[ stim ca 1 j = kg x m² / s²]
masa = Ec x 2 / v² = 2 x 1 j / 1 m²/ s²v= 2 j /m²/s² = 2 kg
[ stim ca 1 j = kg x m² / s²]
[tex]E_c=\frac{1}{2}mv^2 \implies m=\frac{2E_c}{v^2}[/tex]
Numeric, [tex]m=\frac{2J}{1m^2/s^2}=2\:kg[/tex]
Numeric, [tex]m=\frac{2J}{1m^2/s^2}=2\:kg[/tex]