Which of the following statements is incorrect?

1. A Option A: An unaccelerated frame of reference is called an inertial frame of reference
2. B Option B: All frames of reference in uniform rectilinear motion are equivalent
3. C Option C: Newton's laws of motion are valid in an accelerated (non-inertial) frame of reference
4. D Option D: A frame of reference which is either at rest or moves with a constant velocity is called an inertial frame of reference

Answer checked 11 October 2026 · How we write and check questions