An object of mass 300 kg is traveling at (12 m/s) i and coll…

An object of mass 300 kg is traveling at (12 m/s) i and collides with another object of mass 500 kg that is traveling at (18 m/s) j. This collision is an inelastic collision in that both objects get stuck together and travel in a straight line at some final velocity. What is the angle of the final momentum vector relative to the positive x-axis?