Two perons of masses `55` kg and `65` kg respectively, are at the opposite ends of a boat. The length of the boat is `3` m and weight `100` kg. The `55` kg man walks upto the `65` kg man and with him. If the boat is in still water the centre of mass of the system shifts by

Options

A. 3.0 m
B. 2.3 m
C. zero
D. 0.75 m

Answer

C

Explanation

Here on the entire system net external force on the system is zero, hence center of mass remains unchanged.