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To decrease the Kinetic Energy of an object, the primary factor is to decrease the velocity (answer D). Here's a step-by-step explanation:
1. Kinetic Energy is directly proportional to the square of the velocity of an object. This means that as the velocity of an object decreases, its Kinetic Energy decreases as well.
2. By reducing the velocity of an object, you are essentially reducing the amount of energy associated with its motion. This can be achieved by applying brakes to a moving car, for example, which decreases its speed and ultimately its Kinetic Energy.
3. Decreasing the stopping distance (option A) is related to the braking power or efficiency but doesn't directly affect the Kinetic Energy itself.
4. Decreasing the mass of an object (option B) would affect the Kinetic Energy indirectly since Kinetic Energy is also dependent on mass, but changing the velocity has a more significant impact on reducing Kinetic Energy.
5. Decreasing the direction (option C) doesn't have a direct relationship with Kinetic Energy reduction. Kinetic Energy depends on the object's speed and mass, not its direction.
In summary, to effectively decrease the Kinetic Energy of an object, the most direct and impactful factor is to decrease its velocity.
