In a spring-mass system, the mass is 0.1 kg and the stiffness

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In a spring-mass system, the mass is 0.1 kg and the stiffness of the spring is 1 kN/m. By introducing a damper, the frequency of oscillation is found to be 90% of the original value. What is the damping coefficient of the damper?

1. 1.2 Ns/m
2. 3.4 Ns/m
3. 8.7 Ns/m
4. 12.0 Ns/m

Correct Option: C

8.7 Ns/m