JEE Main 3 Apr 2025 Shift 2 Paper

Consider two blocks A and B of masses m1=10‌kg and m2=5‌kg that are placed on a frictionless table.
The block A moves with a constant speed v=3m∕ s towards the block B kept at rest. A spring with spring constant k=3000N∕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)