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.
Hardwick Township is a township in Warren County, New Jersey, United States. As of the 2010 United States Census, the township's population was 1,696,[8][9][10] reflecting an increase of 232 (+15.8%) from the 1,464 counted in the 2000 Census, which had in turn increased by 209 (+16.7%) from the 1,255 counted in the 1990 Census.[18]