Physics - Centre of Mass & Collision Question with Solution | TestHub

Consider two blocks A and B of masses $m_1=10\mathrm{kg}$ and $m_2=5\mathrm{kg}$ that are placed on a frictionless table. The block A moves with a constant speed $v=3\mathrm{m}/\mathrm{s}$ towards the block B kept at rest. A spring with spring constant $\mathrm{k}=3000\mathrm{N}/\mathrm{m}$ is attached with the block B as shown in the figure. After the collision, suppose that the blocks A and B, along with the spring in constant compression state, move together, then the compression in the spring is, (Neglect the mass of the spring)