What does it mean to say that momentum is conserved? when momentum or any other object in physics doesn't change..... momentum = momentum before and after the collision. Elastic collision
The 2016 Springfield, Illinois, population is 116,565. There are 1,955 people per square mile (population density). The median age is 38.7. The US median is 37.4. 44.11% of people in Springfield, Illinois, are married. 14.83% are divorced.
Springfield Demographics Summary. With 165,378 people, Springfield is the 3rd most populated city in the state of Missouri out of 1,023 cities. But watch out, Springfield, because Columbia with 116,906 people and Independence with 117,494 people are right behind you.