Question

ten example of conservation of momentum

Answer 1

I will mention just a few as one can make up different eg just by replacing the similar objects or fluid
m1v1=m2v2
1)Fluid flowing through a nozzle (pipe, diffuser, fuel charge through intake valve in IC Engine, etc)
2)Inline suspended pendulum (marbles, balls, etc)

Answer 2

Answer:

motion of rocket

system of gun and bullet