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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:

12 kg
60 kg
72 kg
96 kg

Correct Answer: 60 kg

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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