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.
Champaign County is a county in the U.S. state of Illinois. As of the 2010 census, the population was 201,081. It is the 10th-most populous county in Illinois. Its county seat is Urbana. Champaign County is part of the ChampaignâUrbana, IL Metropolitan Statistical Area. The twin cities of Urbana and Champaign are the only cities in the county and they nearly surround the campus of the University of Illinois at Urbana-Champaign.