Per NCERT §4.5, the second law F = m a is valid in which kind of reference frame?
AInertial frames only
BAny rotating frame
COnly frame attached to body
DAny accelerating frame
Answer & Solution
Correct answer: A. Inertial frames only
NCERT §4.5: Newton's laws hold in inertial frames. In non-inertial frames, pseudo-forces must be added.
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