One object is traveling northeast with a momentum of 12 kg-m/s, while a second object is traveling southwest on the same path as the first object with a momentum of 4 kg-m/s. when the two objects collide, they stick together. what is the momentum after their collision?
1. responses 8 kg-m/s
2.northeast 16 kg-m/s
3.southwest 8 kg-m/s
4.southwest 16 kg-m/s