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The same law read backwards says acceleration can be non-zero only when there is a net external:
AField on it
BFriction only
CFrequency
DForce on it
Answer & Solution
Correct answer: D. Force on it
1. Acceleration means the velocity is changing.
2. Something outside the body must cause that change.
3. That something is a net external force on it.
_Source: NCERT Class 11 Physics Part I, Chapter 5, Laws of Motion._
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