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.
Sangamon County is a county located in the U.S. state of Illinois. According to the 2010 census, it had a population of 197,465. Its county seat is Springfield, the state capital. Sangamon County is included in the Springfield, IL Metropolitan Statistical Area.