System of Particles and Rotational Motion - Result Question 3

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

[2012]

(a) 3.0m

(b) 2.3m

(c) zero

(d) 0.75m

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Answer:

Correct Answer: 3. (c)

Solution:

  1. (c)

There is no external force so centre of mass of the system will not shift



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