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Question

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

A
3.0 m
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B
2.3 m
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C
zero
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D
0.75 m
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Solution

The correct option is B zero
Here on the entire system net external force on the system is zero hence center of mass
remains unchanged.

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