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.
Springfield is located at 39Â°41â²54â³N 89Â°37â²11â³Wï»¿ / ï»¿39.69833Â°N 89.61972Â°Wï»¿ / 39.69833; -89.61972 (39.6983146, -89.6195900). The city is at an elevation of 558 feet (170 m) above sea level. Located within the central section of Illinois, Springfield is 90 miles (140 km) northeast of St. Louis. The Champaign/Urbana area is to the east, Peoria is to the north, and BloomingtonâNormal is to the northeast. Decatur is 40 miles (64 km) due east.