A particle of mass 6 kg, moving at 4.02 m/s, strikes an identical particle which is initially at rest.

A particle of mass 6 × kg, moving at 4.02 × m/s, strikes an identical particle which is initially at rest. After the interaction, the particles (which can't be distinguished) are observed moving at angles 73.3° and 16.7°, both angles being measured with respect to the original direction of motion. What are the final speeds of the particles?