i think this the correct answer for What is the mass of the fish? You can ignore the mass of the spring.?
Force constant=200/0.125=1600 N/m
Frequency= f =(1/2pi) sq rt [k/m]
squaring and simplifying,
mass = m = k /(2pi*f)^2
m=1600 /(2pi*2.6)^2=5.9953 kg
the mass of the fish is 5.9953 kg
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