System shown in figure is in equilibrium and at rest. The spring and string are massless, now the string is cut. The acceleration of mass 2 m and m just after the string is cut will be

Step-by-step solution

Initially under equilibrium of mass ' m ' T=m g Now, the string is cut. Therefore, T=m g force is decreased on mass m upwards and downwards on mass 2 m . a_m= m g m =g (downwards) and a_ 2 m = m g 2 m = g 2 (upwards)