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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:

a) 12 kg
b) 60 kg
c) 72 kg
d) 96 kg

Answer: b
Explanation: 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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