Physics Question from JEE Main 2025 · 23 January, Shift 1

A gun fires a lead bullet of temperature $300 \, \text{K}$ into a wooden block. The bullet having melting temperature of $600 \, \text{K}$ penetrates into the block and melts down. If the total heat required for the process is $625 \, \text{J}$, then the mass of the bullet is _____ grams. Given Data: Latent heat of fusion of lead = $2.5 \times 10^4 \, \text{J kg}^{-1}$ and specific heat capacity of lead = $125 \, \text{J kg}^{-1} \text{ K}^{-1}$.