The static deflection of a spring under gravity, when a

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The static deflection of a spring under gravity, when a mass of 1 kg is suspended from it, is 1 mm. Assume the acceleration due to gravity g = 10 m/s². The natural frequency of this springmass system (in rad/s) is _______

1. 100 rad /sec
2. 10 rad /sec
3. 150 rad /sec
4. None of the above

Correct Option: A

g = 10 m/s², m = 1 kg
Deflection: ∆ = 1 mm

= 100 rad /sec