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A hammer of mass 1kg having speed of 50 m/s, hit a iron nail of mass 200 gm. If specific heat of iron is 0.105 cal/gm°C and half the energy is converted into heat, the raise in temperature of nail is

1. 7.1°C
2. 9.2°C
3. 10.5°C
4. 12.1°C

Correct answer: 7.1°C

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