Block A of mass $1.0\ \text{kg}$ slides at $6.0\ \text{m/s}$ on a smooth floor towards block B of mass $2.0\ \text{kg}$, which is at rest. A light spring of force constant $300\ \text{N/m}$ is fixed to the face of B that A will hit, as shown in the figure. Which of the following statements are correct?

Fig. 1: On a smooth floor, block A of mass 1.0 kg moves to the right at 6.0 m/s towards block B of mass 2.0 kg, which is at rest. A light spring of spring constant k = 300 N/m is fixed to the left face of B and points towards A.