A vibrating system consists of mass of 50 kg, a spring with a stiffness of 30 kN/m and a damper. If damping is 20% of the critical value, the natural frequency of damped vibrations will be

A vibrating system consists of mass of 50 kg, a spring with a stiffnes

1.	A vibrating system consists of mass of 50 kg, a spring with a stiffness of 30 kN/m and a damper. If damping is 20% of the critical value, the natural frequency of damped vibrations will be
A.	16 rad/s
B.	20 rad/s
C.	24 rad/s
D.	28 rad/s
Answer» D. 28 rad/s