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m=0,1kg W=?
s=7m
W=F×S
F=m×g
F=0,1kg×10m/s²
F=1N
W=F×S
W=1N×7m
W=7J=0,007 kJ
m=0,1kg
h=7m
g=10 n/kg
Obl?
W?
Wzór
Epg= m*h*g
Epg=0,1*7*10=7J
J= kg* m*N\kg= N*m
Odp: mama wykonała prace 7 J.