Answer :
Hi there!
Using Hooke's Law:
[tex]F = kx[/tex]
F = Force (N)
k = Spring constant (N/m)
x = displacement from equilibrium
We are given the force and displacement, so solve for 'k':
[tex]k = \frac{F}{x}\\
\\
k = \frac{230}{0.4} = \boxed{575 N/m}[/tex]