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Q: Which of the following statements is true with respect to a car running at constant acceleration on a straight road with a flat plane?
  • A. The acceleration of the car is zero.
  • B. The velocity of the car is zero.
  • C. The acceleration of the car is constantly changing.
  • D. The velocity of the car is constantly changing.
Correct Answer: Option D - If a body (car) is moving at a fixed acceleration, its velocity will change continuously, if the body is moving at a fixed speed, its acceleration will be zero because rate of change of velocity/unit time is called acceleration.
D. If a body (car) is moving at a fixed acceleration, its velocity will change continuously, if the body is moving at a fixed speed, its acceleration will be zero because rate of change of velocity/unit time is called acceleration.

Explanations:

If a body (car) is moving at a fixed acceleration, its velocity will change continuously, if the body is moving at a fixed speed, its acceleration will be zero because rate of change of velocity/unit time is called acceleration.