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V=2m³
g= 10 m/s²
F=m*g
1000N=m * 10 m/s²
1000 kg*m/s²=m*10 m/s² / : 10 m/s²
m=100 kg - masa klocka
D=m/V
d= 100 kg/2 m³
d=50 kg/m³ - gęstość klocka
Teraz proszę o najlepszy :)