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w=5*10*40
w=2000
m=5kg
h=40cm=0,4m
g=10N/kg
szukane:
W=?
W=F *h
F=m *g
czyli W=m* g *h
W= 5kg * 10 N/kg * 0,4m
W= 20 J
odp: wykonano pracę 20 J.