Two persons of mass 55kg and 65kg respectively are at the opposite ends of boat. The length of boat is 4m and weighs 120kg. The 55kg man walks up to 65kg man and sits with him. If the boeat is still in water the centre of mass of the system shifts by:
1m
2.5m
zero
1.5m
There is no external force on man so there will not be any shift.