alleryAcceleration can be non zero only if there is a net external:
ACharge
BVolume
CWeight
DForce
Answer & Solution
Correct answer: D. Force
1. Nothing inside a body can change its own motion.
2. A change of velocity has to be caused from outside.
3. So acceleration needs a net external force.
_Source: syllabus Physics Part I, Chapter 5, Laws of Motion._
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