How is kinetic energy defined in a scientific context?

Kinetic energy is defined as the energy that an object possesses due to its motion. This concept can be tied to the work needed to accelerate an object to a specific speed, which is precisely what makes the correct answer valid. When a force acts on an object, it does work on that object, which results in an increase in its speed and, consequently, its kinetic energy. The formula for kinetic energy, expressed as KE = 1/2 mv², shows that kinetic energy is directly related to both the mass of the object and the square of its velocity.

The other choices don't accurately capture the essence of kinetic energy. While maintaining speed and stopping a vehicle are aspects related to motion, they don't define kinetic energy itself. Similarly, discussing energy lost during deceleration focuses on a different aspect of motion, specifically the energy exchange when a vehicle comes to a halt. Thus, the definition that emphasizes the work required to accelerate an object aligns correctly with the scientific understanding of kinetic energy.