Answer:
The mass of the fish is 5.56 kg.
Step-by-step explanation:
Given that,
Force = 250 N
Length = 14.0 cm
Frequency = 2.85 Hz
Suppose ignoring the mass of the spring, what is the mass m of the fish?
We need to calculate the spring constant
Using formula of spring constant

Where, F = force
x = length
Put the value into the formula


We need to calculate the mass of the fish
Using formula of frequency


Put the value into the formula


Hence, The mass of the fish is 5.56 kg.