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Q.

Two persons of masses 55kg and 65kg respectively, are at the opposite end of a boat. the length of boat is 3.0 m and weighs 100kg. The 55 kg man walks upto 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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a

0.75 m

b

2.3 m

c

Zero

d

3.0 m

answer is A.

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Detailed Solution

Internal forces cannot effect position of the centre of mass. Man walking in the boat is an internal force. So centre of mass of the system does not change.

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