A boat having a length 4 m and breadth 2 m is floating on a lake. The boat sinks by 1cm when a man gets on it. The mass of the man is:
Choose the correct choice.
A) 12 kg B) 60 kg C) 72 kg D) 80 kg E) None of these
Explanation:   Volume of water displaced = (4 x 2 x 0.01) m3   = 0.08 m3.   ∴ Mass of man = Volume of Water displaced x Density of water   = (0.08 x 1000)kg   = 80 kg.   Answer: 80 kg
<result>D</result>
A boat having a length 4 m and breadth 2 m is floating on a lake. The boat sinks by 1cm when a man gets on it. The mass of the man is: