A block of mass`m= 20g` is attached to one end of an inextensible thread passing over two frictionless and massless pulleys as shown in figure. The spring constant of the spring is `2 N //m`. Suppose the blockis pulled downward and released .
The natural frequency of oscialltion of system is Hz
A. `(1)/(2pi)`
B. `(5)/(2pi)`
C. `(3)/(pi)`
D. `(3)/(2pi)`
