In equilibrium position,
mg = k * ΔL
k = (mg) / (ΔL)
k = (8 * 9.81) / (0.077) N/m
k = 1019.22 N/m
frequency, f
f = (1/2π) √(k/m)
f = (1/2π) √(1019.22/8)
f = 1.7973 Hz
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