22 Three identical ideal springs (X,Y,Z) are arranged as shown. When a 4.0 k; mrass; I hury; Oni X the mass descends 2.0 cm; When a 6.0-kg rass Is hung or1 Y, the mass dlescerdk ; 1 2 Y a) b) 4.0 cm 9.0 cm 2.0 cm 4.5 cm 6.0 cm Bos birak