Physics - NLM Question with Solution | TestHub

An ideal spring of spring constant $\mathrm{K}=10\mathrm{N}/\mathrm{m}$ is hung vertically by a rigid support. On the other end a system of masses 2kg & 5kg connected by a string AB is attached as shown in figure. The system is initially at rest. Now string AB is cut at $\mathrm{t}=0$ :-