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.
Situated on the northeastern edge of the country, this tiny territory contains the town of Plymouth, home to the Pilgrim colony of 1620, and as one of the first settled states, the population statistics have always been healthy. As of 2016, Massachusetts' population stands at 6,794,422. Moving forward to the present day, the Massachusetts population in 2016 has risen beyond the 6.7 million mark and it is the 3rd most densely populated area in the United States, despite being the 7th smallest state in the country.