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During the Indo-Pakistan war, a soldier ...

During the Indo-Pakistan war, a soldier observed that the lead bullet fired by him just melted, when stopped by an obstacle. Assuming that whole of the kinetic energy of bullet got converted into heat energy, calculate the velocity of the bullet. Given that initial temperature of the bullet `= 47.6^(@)C`. Melting point of lead `321^(@)C`, specific heat of lead `= 0.3 cal g^(-1).^(@)C^(-1)`, latent heat of lead `= 6 cal g^(-1)` and `J = 4.2 xx 10^(7) erg cal^(-1)`.

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