A body at rest for one observer may be moving steadily for another because motion is:
ARestricted
BRelative
CReversible
DRepeatable
Answer & Solution
Correct answer: B. Relative
1. Two observers can disagree about being at rest.
2. Each judgement depends on the frame used.
3. So motion is relative.
_Source: OpenStax University Physics Volume 1, Chapter 12, Static Equilibrium and Elasticity._
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