Question

if the extrenal force acting on zero, then​

Answer 1

Answer:

If the external force acting on a system have zero resultant, then the total momentum remain . constant i.e conserved. Hence, the center of mass remains at rest or move with a constant velocity.

Answer 2

Answer:

then the total momentum remain . constant i.e conserved. Hence, the center of mass remains at rest or move with a constant velocity.hope you understand