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r1=6 cm
r2=4cm
h=1m = 100 cm
V=V1-V2
V1=πr²h
V1=π6²*100
V1=3600π cm³
V2=πr²h
V2=π4²*100
V2=1600π cm³
V=3600π-1600π=2000 π cm³ = 6280 cm³
6280*7,8= 48984 g ≈ 48,9 kg
Odp. metra takiej rury waży 48,9 kg