Question

Determina masa corpului care parcurge o suprafata orizontala de 10 m stiind ca in momentul initial enercia cinetica eeste 50 j

Answer 1

50J = mg·d; m = 50J/100 = 0,5kg

Answer 2

$d=10 \ m \\ g=10 \ N/kg \\ E_c=E_p=50 \ J\\ \boxed{m-?} \\ \bold{Rezolvare:} \\ \boxed{E_p=m \cdot g \cdot d} \\ m=\frac{E_p}{g \cdot d} \\ m=\frac{50 \ J}{10 \ N/kg \cdot 10 \ m}=\frac{50 \ J}{100 \ N/kg \cdot m} \\ \Rightarrow \boxed{m=0,5 \ kg=\bold{500 \ g}}$