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A metal ball of mass 0.1 kg is heated upto 500°C and dropped into a vessel of heat capacity 800 JK –1 and containing 0.5 kg water. The initial temperature of water and vessel is 30°C. What is the approximate percentage increment in the temperature of the water? [Specific Heat Capacities of water and metal are, respectively, 4200 Jkg –1 and 400 Jkg –1 K –1 ]

1. 20%
2. 25%
3. 15%
4. 30%

Correct answer: 20%

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