The two blocks having masses m1 = 1.8 kg and m2 = 4.5 kg are at rest on a frictionless surface having a compressed spring among them. The spring is primarily compressed by 45.0 cm and has negligible mass. If both blocks are released concurrently and the spring has dropped to the surface, m1 is found to encompass a speed of 2.5 m/s.
i) Determine the speed of m2?
ii) Determine the spring constant of the spring?