Momentum is conserved in case of motion under gravity because a object is pulled by the earth and the earth of pulled by the object. The momentum terms of the object and earth cancel each other out as the object has small mass but high velocity and the earth has very high mass and very small velocity in the opposite direction of the velocity of the object.
Southwick, Massachusetts. Southwick is a town in Hampden County, Massachusetts, United States. The population was 9,502 at the 2010 census. It is part of the Springfield, Massachusetts Metropolitan Statistical Area.
Location of South Boston on a map. South Boston is a city found in Massachusetts, The United States Of America. It is located 42.33 latitude and -71.05 longitude and it is situated at elevation 20 meters above sea level. South Boston has a population of 571,281 making it the 2nd biggest city in Massachusetts.