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Question

A boat having a length 3 m and breadth 2 m is floating on a lake. The boat sinks by 1 cm when a man gets on it. The mass of the man is:

Options:
A .  12 kg
B .  60 kg
C .  72 kg
D .  96 kg
E .  None of these
Answer: Option B
 -     Volume of water displaced = (3 x 2 x 0.01) m3
  = 0.06 m3.  
  Mass of man  = Volume of water displaced x Density of water
   = (0.06 x 1000) kg
   = 60 kg.

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