The total momentum of the two objects remains the same after the collision, assuming there are no external forces acting on the system. This is known as the law of conservation of momentum.

Here's a more detailed explanation:

* Momentum is a measure of an object's mass in motion. It is calculated as momentum (p) = mass (m) x velocity (v).

* The law of conservation of momentum states that the total momentum of a closed system (a system not subject to external forces) remains constant over time.

* In a collision, the momentum of each individual object might change, but the sum of their momenta before the collision equals the sum of their momenta after the collision.

Important Notes:

* This principle applies to both elastic collisions (where kinetic energy is conserved) and inelastic collisions (where some kinetic energy is lost, for example, due to heat or sound).

* The principle assumes no external forces are acting on the system. If there are external forces, such as friction or air resistance, the total momentum of the system will change.

Let me know if you'd like to explore examples or specific scenarios!