Oscillations Part 2

In figure (A), mass '2 m' is fixed on mass ' m ' which is attached to two springs of spring constant k. In figure (B), mass ' m ' is attached to two springs of spring constant ' k ' and ' 2k′. If mass ' m ' in (A) and in (B) are displaced by distance ' x ' horizontally and then released, then time period T1 and T2 corresponding to (A) and (B) respectively follow the relation.