Physic (Momentum) Please Help ASAP?

Question

Which of the following is the most accurate statement of the law of conservation of momentum?
Momentum is a vector quantity.
The impulse acting on an object is equal to the momentum change it causes on another object.
When two objects collide, the momentum of each object stays the same.
The total momentum of a system of objects before and after an interaction is the same, if there are no outside forces acting.


Which of the following is the definition of the law of conservation of momentum?
The total momentum in a closed system is constant.
The total momentum in a closed system changes as objects collide.
The total momentum passed from one object to another is a constant.
Force is the product of mass and acceleration.

Answer 1

The total momentum of a system of objects before and after an interaction is the same, if there are no outside forces acting



The total momentum in a closed system is constant

Answer 2

the first answers soln. is d(which states the law of conversation of momentum)

The total momentum of a system of objects before and after an interaction is the same, if there are no outside forces acting.



The total momentum in a closed system is constant.

the above answer also comes from law of conversation of momentum

Answer 3

The first definition I believe is correct.