A 2-Kg Mass Is Hung from a Spring (K = $\pi$

Multiple Choice

A 2-kg mass is hung from a spring (k = 18 N/m) , displaced slightly from its equilibrium position, and released. What is the frequency of its vibration?

A) 1.5 $\pi$ Hz
B) 1.5 Hz
C) 3.0/ $\pi$ Hz
D) 1.5/ $\pi$ Hz
E) 3.0 Hz