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 weighs 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 :
(1) zero
(2) 0.75 m
(3) 3.0 m
(4) 2.3 m
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