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.
The Office of Management and Budget has designated the three-county Champaign-Urbana area as one of its metropolitan statistical areas (the Champaign-Urbana, IL MSA), which are used for statistical purposes by the Census Bureau and other agencies. The area has a population of 231,891 as determined by the 2010 U.S. Census.