In the reference frame K two particles travel along the x axis, one of mass m1 with

Question:

In the reference frame K two particles travel along the x axis, one of mass m1 with velocity vl, and the other of mass m1 with velocity v2. Find:
(a) The velocity V of the reference frame K' in which the cumulative kinetic energy of these particles is minimum;
(b) The cumulative kinetic energy of these particles in the K` frame.