Two particles of mass 2.3 kg and mass 4.3 kg that are free to move on a

Question:

Two particles of mass 2.3 kg and mass 4.3 kg that are free to move on a horizontal track are initially held at rest so that they compress a spring as shown in Figure P7.54. The spring has a spring constant k = 400 N/m and is compressed 0.12 m. Find the final velocity of each particle.

Figure P7.54