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1) m=5kg
El=196 J
h=?
2) 50 m
F=40 N
Alfa = 60°
Lm=?
3) m=2 g
v=500m/s
Ec=?
4) m=800kg
v=54km/h
Ec=?



Răspuns :

Baiatul122001
1. Ep=mgh=>h=Ep/mg=196/5*10=3,92 m
2.L=F*d*cosα=40*50*cos 60°=200/2=100 J
3.m=2 g=0,002 kg
Ec=m*v²/2=0,002*500/2=0,5 J
4.v=54 km/h=15 m/s
Ec=m*v²/2=800*15²/2=90000 J=90 kJ

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