Answer:
The law of conservation of momentum says that the momentum of a closed system is constant in time (conserved). A closed (or isolated) system is defined to be one for which the mass remains constant, and the net external force is zero. The total momentum of a system is conserved only
when the system is closed
Explanation:
Huwag ninyong lahatin ang pag copy ito lang ang kopyahin ninyo kasi po ako maronong mag line talaga yung ano
Only when the system is closed
