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Hailstone at 0°C falls from a height of 1 km on an insulating surface converting whole of its kinetic energy into heat. What part of it will melt ) / 10 ( 2 s m g 

1. 33 1
2. 8 1
3. 4 10 33 1  
4. All of it will melt

Correct answer: 33 1

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