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.
The 2014 Springfield, Massachusetts, population is 153,278. There are 4,810 people per square mile (population density). The median age is 31.8. The US median is 37.2. 37.02% of people in Springfield, Massachusetts, are married. 11.65% are divorced. The average household size is 2.64 people. 21.48% of people are married, with children. 36.71% have children, but are single.