![The equation of motion for a spring-mass system excited by a harmonic force is](https://www.gkseries.com/blog/wp-content/uploads/2023/10/The-equation-of-motion-for-a-spring-mass-system-excited-by-a-harmonic-force-is.jpg)
Q. The equation of motion for a spring-mass system excited by a harmonic force is
![](https://www.gkseries.com/blog/wp-content/uploads/2023/10/Screenshot-1042.png)
where M is the mass, K is the spring stiffness, F is the force amplitude and w is the angular frequency of excitation. Resonance occurs when w is equal to
![](https://www.gkseries.com/blog/wp-content/uploads/2023/10/Screenshot-1043.png)
Ans: Option D