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.
There is not a single city or town name that is found in every single state, but Springfield is a rather popular city name. Some of states actually have more than one city named Springfield. Wisconsin has five cities with the name Springfield. Springfield, Missouri is the most populous city with this name. As of 2015, it has a population of more than 420,000 people in its metro area.