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.
As of 2010-2014, the total population of Champaign, Urbana Area is 234,672. The Champaign, Urbana Area population density is 121.96 people per square mile, which is lower than the state average density of 222.21 people per square mile and is higher than the national average density of 82.73 people per square mile. The most prevalent race in Champaign, Urbana Area is white, which represent 77.23% of the total population.