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masa chłopca wynosi: 50 kg
Ep/gh=m
m=2500J/(10m/s2*5m)=2500J/50=50kg
m= ?
g=10m/s²
h=5m
Epg=2500J
2500J = m * 10m/s² * 5m
2500 kg = 50 m
50 kg = m
Chłopiec waży 50 kg