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Per NCERT §6.3, in a system on which no external force acts, the centre of mass does which?
AAccelerates uniformly under no force
BAlways remains exactly at the origin
COscillates back and forth periodically
DMoves at constant velocity (or stays at rest)
Answer & Solution
Correct answer: D. Moves at constant velocity (or stays at rest)
NCERT §6.3: F_ext = 0 ⇒ A_cm = 0 ⇒ V_cm constant. CM may be moving uniformly or at rest.
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