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A₁ • v₁ = A₂ • v₂
(πr₁²) • v₁ = (πr₂²) • v₂
r₁² • v₁ = r₂² • v₂
8² • 3 = 4² • v₂
64 • 3 = 16 • v₂
v₂ = (64 • 3)/16
v₂ = 12 m/s
Jadi, kecepatan fluida di dalam pipa kedua adalah 12 m/s