please answer this question with clear physics diagram and using vector sign.

4. Two square blocks of mass 2m and 5m rest on a frictionless surface and compress a spring between two faces. When released they fly apart so that the heavier mass moves with speed 122 = 2.3 m/s. Note that m = 1.5 kg and the compression of the spring is one meter. a. (5 points) Draw a good physics diagram; use a straight edge. I). (15 points) What is its elastic constant of the spring