For a spring-mass system the spring constant is 245 N/m and the mass is 22 kg. The natural frequency of this system is:
a. 2.1 rad/s
b. 2.6 rad/s
c. 3.34 rad/s
d. 5.2 rad/s
In this case I think they are refering to the circular frequency ...
The solution provides explanations and answer for the spring-mass system problem.