Question

Two persons of masses $55kg$ and $65kg$ respectively, are at the opposite ends of the boat. The length of the boat is $3.0m$ and weigh $100kg$. The $55kg$ man walks to the $65kg$ man and sits with him. If the boat is in stil water the centre of mass of the system shifts by

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

Answer 1

Answer: (C)

$zero$

Here on the entire system net external force on the system is zero hence center of mass

remains unchanged.