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m=?
V=2dm³ = 0,002m³
q - gęstość
q=920kg/m³
q=m/V
920 = m / 0,002
m = 920 * 0,002 = 1,84kg
2)
q(woda) = 998 kg/m³
V = 2m * 3m * 1,5m = 9m³
q=m/V
m=q*V
m=998*9 = 8982kg