A 2.50 kg particle that is moving horizontally over a floor with velocity (-3.00 m/s) j undergoes a completely inelastic collision with a 4.00 kg particle that is moving horizontally over the floor with velocity (4.50 m/s) i. The collision occurs at xy coordinates (-0.500 m, -0.100 m). After the collision and in unit-vector notation, what is the angular momentum of the stuck-together particles with respect to the origin?