Question

Calculati lucrul mecanic efectuat de greutatea unui corp cu masa de 250 g cand cade de la inaltimea de 15 m ( g = 10 N/kg)

Answer 1

G=m•g, 250g=0,25 kg => G=0,25kg•10N/kg, G=2,5 N , L= F•d, L= G•h, L=2,5N•15m, L= 37,5J

Answer 2

m=250 g=0,25 kg
d=15 m
g=10 N/kg
L=?
L=G*d
G=m*g
G=0,25 kg*10 N/kg
G=2,5 N
L=2,5 N*15 m
L=37,5 J
Raspuns: L=37,5 J.