Question

Two persons of masses $55\, kg$ and $65\, kg$ respectively, are at the opposite ends of a boat. The length of the boat is $30\,. m$ 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 center of mass of the system shift by:

• A. 3.0 m
• B. 2.3 m
• C. Zero
• D. 0.75 m

Answer 1

Answer: (C)

Zero

Answer 2

Since net external force on the system is zero hence C.O.M. remains unchanged.