* Conservation of Momentum: This law states that the total momentum of a closed system remains constant. Momentum is a measure of an object's mass in motion (mass x velocity).
* External Forces: When external forces act on a system, they can change the momentum of objects within the system. This means the total momentum is no longer conserved.
Let's break down the other options:
* a. in absence greatest velocity: Velocity doesn't directly affect the application of the law of conservation of momentum. The law applies regardless of the velocity of the objects involved.
* b. presence least velocity: Similarly, the presence of low velocity doesn't negate the law. The law still holds, even if objects are moving slowly.
* d. o?: This option is unclear. It's not a valid situation in this context.
In summary: The law of conservation of momentum is a fundamental principle in physics. It holds true in systems where no external forces are acting, allowing us to analyze and predict how momentum changes within that system.
