PAKISAGOT NG MAAYOS PLEASE:)
Figure 1. A system is a group of objects that interact and affect each other. Examples are (a) Bowling ball and pin and (b) two football players.
Figure 2. In this example, the total momentum of the boy- girl system before pushing is zero. After pushing, the total momentum of the boy-girl
system is still zero because the momentum of the girl is of equal magnitude but opposite direction to the momentum of the boy. Note that the
momentum of the boy alone is not the same before and after pushing; and the momentum of the girl alone is not the same before and after
pushing.
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