The system shown in the figure is in equilibrium at rest . The spring and string are massless Now the string is cut . Find the acceleration of the blocks just after the string is cut

Explanation

Under equilibrium of mass m
T= mg.
Now the string is cut , Therefore
T=mg force is decreased on mass m upwards and downwards on mass 2m.
`:.` Acceleration of `(mg)/m=g`
Acceleration of `2m=(3mg-2mg)/(2m)=g/2`