Which of the following is the most accurate statement of the law of conservation of momentum?

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

b. momentum is a vector quantity.

c. when two objects collide, the momentum of each object stays the same.

d. the impulse acting on an object is equal to the momentum change it causes on another object.

Every option is correct except option C.

Option A is the most accurate statement of the law

Explanation:

C is incorrect because momentum of the SYSTEM is conserved and not necessarily that of the individual objects in the System.

For option B, momentum is a vector quantity but it does not describe the principal of conservation of momentum. Option D is also correct but does not state anything about the conservation of momentum.