(2) An energetic particle with the rest mass of a neutron M₁ = 937 MeV/c² and a kinetic energy of 5 x 937 MeV collides with a particle at rest with a rest mass of 2 x 937 MeV/c². A composite particle is created in this collision. What is the rest mass and the kinetic energy of the new composite particle?

Fig: 1