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W drganiach harmonicznych x = A·sin(ω·t + ϕ) = A·sin(2π·t/T + ϕ)
W tym przypadku:
A·sin(2π·t/T + 0) = √2/2·A
sin(2π·t/T) = √2/2
2π·t/T = π/4
t = T/8 = 4/8 = 0.5 s