A body A of mass 1kg is resting on a table and connected to body B and C as shown. The surface are smooth and string and spring are massless. The string is inextensible. Find the extension in the spring if force constant of spring $=k=50 N/m$ take $(g=10 m/s^2)$

Question

$$(a)\;0.2 m \quad (b)\; 0.1 m \quad (c)\;0.05 m \quad(d)\;0.25 m$$