What is the natural frequency of this system?

[Arunsaikalki]

Homework Statement

A spring mass system is attached to a
Horizontal simple pendulum at the middle of its string as shown in image. What is the natural frequency of the system??

Relevant Equations

F = - Kx for spring mass system

 

[Physics lover]

Homework Statement:: A spring mass system is attached to a
Horizontal simple pendulum at the middle of its string as shown in image. What is the natural frequency of the system??
Relevant Equations:: F = - Kx for spring mass system

View attachment 261386

Please post your attempt so that we can review it and help you.Also please mention the details of the question,whether the left string is inextensible or not,are the oscillation sideways or along the spring.