An ice bullet of temperature − 10°C is fired upon an object. The bullet spends 20% of its kinetic energy in penetrating into the object and remaining kinetic energy is spent into melting the bullet at 0°C. The latent heat of fusion of ice is 3·4 × 10^5 J kg^-1 and its specific heat capacity is 2000 J kg^-1 K^-1. Which one among the following is the correct initial speed of the bullet ?
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