Question

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

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

Answer 1

The correct option is A Zero

In this net external force on the entire system is zero.

$\therefore$Center of mass of the system remains unchange. Hence the shift of center of mass of the system is zero.