A) In all cases
B) Only when the man is stationary initially and finally
C) Only if the man moves without acceleration on the boat
D) Only if the man and the boat have equal masses
Correct Answer: A
Solution :[a] There are no external horizontal forces acting on the? man plus boat' system. (The forces exerted by the man and the boat on each other are internal forces for the system.) Therefore, the centre of mass of the system, which is initially at rest, will always be at rest.
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