What are the acceleration of each block when1)-1 is cut2)-2 is cut3)-3 is cutFrom the given figure.

Under equilibrium,

Tension in spring 1 is 3mg.

Tension in string 2 is 5mg

Tension in spring 4 is 6mg

1) When string 1 is cut, 3m mass is under free fall and thus has acceleration g.
Spring 3 sitll has tension of 6mg.
Hence, T-2mg=2ma and 6mg-T=ma
Hence,

2) When string 2 is cut, 2m block is under tension from spring 1 with downward force of 3mg. Hence acceleration of block 2m is
Similarly acceleration of block 3m is

3) When spring 3 is cut,block A is under free fall. 2m and 3m will again have accelerationsrespectively.