Question

A boat having a length of 3 metre and breadth 2 metre is floating on a lake. The boat sinks by one cm when a man gets on it. The mass of the man is:

• A. 60 kg
• B. 62 kg
• C. 72 kg
• D. 128 kg

Answer 1

The correct option is A 60 kg

Amount of water displaced is $V=3\times 2\times 0.01=0.06m^3$
$\therefore F=1000\times 0.06\times g=60g$
hence the man weighs 60kgs