Question

two bumper cars move toward each other. the cars hit and bounce off of each other. the momentum before the collision will be equal to the after.

Explanation:

According to the law of conservation of momentum, in an isolated - system (like the bumper - car collision assuming no external forces), the total momentum before a collision is equal to the total momentum after the collision. Force, impulse, and velocity do not have this direct conservation relationship in the context of the question.

Answer:

momentum