Physics - SHM Question with Solution | TestHub

Two blocks $\mathrm{P}$ and $\mathrm{Q}$ of masses $\text{0.3} \mathrm{kg}$ and $\text{0.4} \mathrm{kg}$ respectively are stuck to each other by some weak glue as shown in the figure. They hang together at the end of a spring with a spring constant $\mathrm{k}=200 \mathrm{N} {\mathrm{m}}^{-1}$. The block $\mathrm{Q}$ suddenly falls free due to failure of glue, then find the maximum kinetic energy of the block $\mathrm{P}$ during subsequent motion (in $\mathrm{mJ}$).