Which statement matches the acceleration concept?

Which statement matches the acceleration concept?

• A. The change in velocity over time
• B. Going only as fast as the acting body makes it
• C. A constant velocity independent of forces
• D. The energy of motion

Answer: (B)

Acceleration is the rate at which velocity changes over time. The statement that expresses “the change in velocity over time” fits this idea exactly, because acceleration is defined as how quickly velocity increases or decreases as time passes. If a vehicle speeds up, slows down, or alters direction, its velocity is changing, and that change per unit time is acceleration. The other ideas describe different concepts. Saying you go only as fast as the acting body makes it captures speed produced by a force at a given moment, not how quickly velocity is changing. A constant velocity regardless of forces implies no acceleration. The energy of motion refers to kinetic energy, which is related to motion but not to the rate of change of velocity. For example, if a car increases its speed from 10 m/s to 20 m/s in 2 seconds, its acceleration is 5 m/s^2, illustrating the rate of change in velocity over time.

Acceleration is the rate at which velocity changes over time. The statement that expresses “the change in velocity over time” fits this idea exactly, because acceleration is defined as how quickly velocity increases or decreases as time passes. If a vehicle speeds up, slows down, or alters direction, its velocity is changing, and that change per unit time is acceleration.

The other ideas describe different concepts. Saying you go only as fast as the acting body makes it captures speed produced by a force at a given moment, not how quickly velocity is changing. A constant velocity regardless of forces implies no acceleration. The energy of motion refers to kinetic energy, which is related to motion but not to the rate of change of velocity. For example, if a car increases its speed from 10 m/s to 20 m/s in 2 seconds, its acceleration is 5 m/s^2, illustrating the rate of change in velocity over time.