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dane:
s=2m
W=1kJ=1000J
F tarcia=150N
szukane:
F =?
W= F *s
F=W/s
F=1000J/2m
F=500N
F w=500N-150N
Fw=350N
zad2
F=60N
W=3,6kJ=3600J
szukane:
s=?
W=F *s
s=W/F
s=3600J/60N
s=60m
zad3
s=5m
m=4kg
g=10N/kg
szukane:
W=?
W=F *s
F=m *g
W=m *g *s
W=4kg *10 N/kg *5m
W=200J