Law of conservation of linear momentum states:
if Fext=0., then linear momentum remains conserve........
If we consider only particle as system , then gravitational force is external and so..........linear momentum does not remain constant......
and If you consider gravitational force as internal force,then both earth and the mass has to be consider as single system ......so.linear momentum of system remains constant...........if particle goes up then momentum of particle decrease.....and momentum of earth increases.......but mass of earth is so large that its velocity produced is very small that it can be neglected...............
rate if satisfied!!!!!!!!!!!!!!!
Moderation Team
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