JEE Main 2022 Physics question
A lead bullet penetrates into a solid object and melts. Assuming that 40% of its kinetic energy is used to heat it, the initial speed of the bullet is: (Given initial temperature of the bullet = 127°C, Melting point of the bullet = 327°C, Latent heat of fusion of lead = J Specific heat capacity of lead = 125 J/kg K)
Answer: (2)
Solution
= mL + . So $/5 = 2.5 × + 125 × 200 = 2.5
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