Question

When no external force acts on two different objects, their total momentum

remains​____ .

Answer 1

Answer:

conserved

Explanation:

hope it helps

Answer 2

Answer: Given :   f  ext  =0

∴      dtdP=F  ext =0                     ⟹P=constant

Thus total linear momentum of the system is conserved  i.e total momentum before the collision is always equal to the total momentum after the collision.