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NEET 2012 (AIPMT, Prelims) · Motion of Centre of Mass

Motion of Centre of Mass question from NEET 2012 (AIPMT, Prelims)

Q11NEET 2012 · AIPMT · PRELIMSEasy

Motion of Centre of Mass

Two persons of masses 55 kg and 65 kg respectively, are at the opposite ends of a boat. The length of the boat is 3.0 m and weights 100 kg. The 55 kg man walks up to the 65 kg man and sits with him. If the boat is in still water the centre of mass of the system shifts by:

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Answer: (c)

Water is still and friction-free horizontally, so no external horizontal force acts on man + man + boat.
The man walking is an internal motion; the boat moves back to compensate.
So the centre of mass does not shift: answer (c) zero.

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