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W=5J
m=0,1kg
W=mgh
W/mg=h
5J/0,1*10=5m
zad
m=3kg,h=50m,v=72km/h=20m/s
E=Ek+Ep=mgh+mv2/2=3*10*50+3*20^2/2=1500J+1200/2=1500J+600J=2100J
zad3
E=mgh=70kg*10N/kg*h=28000J
h=28000J/700N
40m=h