Răspuns :
Răspuns:
5. Ep=mgh
Ep=1kJ=1000J
1000J=10*10*h => h=10m
6. Ec=mv²/2
Ec=200J
mv²/2=200J
v=d/t <=> v=100/10=10m/s
m*10²/2=200 <=> 50m=200 => m=4kg
Răspuns:
Salut
Problema 5.
Ep=m•g•h
1kJ=1000J
1000J=10kg•10N/kg•h
h=1000N•m/100N=10m.
Problema6.
Ec=m•v²/2
Ec=200J
m•v²/2=200J
v=d/t
v=100/10=10m/s
m•10²/2=200
50m=200
m=4kg.
==evergreen==