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s=6 m F=?
h=2 m W=?
m=150 kg
g=10 m/s²
Ep=m*g*h
Ep=150 kg* 10 m/s²* 2m
Ep=3000 J
Ep=W
W=3000 J
W=F*s //:s
F=W/s
F=3000 J/6 m
F=500 N
Odp:Szafę wciągano po desce ruchem jednostajnym siłą 500 N.