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V≈ 3 * (0,01m)² * 2m
V≈ 3* 0.0001 *2 = 0.0006m³
1 m³ 7500kg
0.0006 m³ x
x= 7500 * 0.0006
x= 4,5
Odp. Pręt waży około 4,5 kg