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Newton's first law says a body keeps its state unless compelled by:

AAn external formula
BAn external frame
CAn external force
DAn external factor
Answer & Solution
Correct answer: C. An external force
1. Rest and uniform straight line motion are both states. 2. Something must intervene to change either. 3. It is an external force. _Source: syllabus Physics, Ch 4 'Laws of Motion'_
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