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A bullet moving with a uniform velocity v, stops suddenly after hitting the target and the whole mass melts be m, specific heat S, initial temperature 25°C, melting point 475°C and the latent heat L. Then v is given by

1. J mv mS mL 2 2 1 ) 25 475 (    
2. J mv mL mS 2 ) 25 475 ( 2   
3. J mv mL mS 2 ) 25 475 (   
4. J mv mL mS 2 ) 25 475 ( 2   

Correct answer: J mv mL mS 2 ) 25 475 ( 2   

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