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 bullet is : (Given : initial temperature of the bullet =127^{\circ} {\C}, Melting point of the bullet =327^{\circ} {\C}, Latent heat of fusion of lead =2.5 \times 10^4 {\J} {\kg}^{-1}, Specific heat capacity of lead .=125 {\J} \/ {\kg} {\K}) [27-Jun-2022-Shift-2]

JEE Main 27 June 2022 Shift 2 Solved Paper

Section: Physics

Question : 39 of 90

Marks: +1, -0

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 bullet is :
(Given : initial temperature of the bullet =127∘C, Melting point of the bullet =327∘C, Latent heat of fusion of lead =2.5×104J kg−1, Specific heat capacity of lead .=125J∕kg‌K)

[27-Jun-2022-Shift-2]

125ms−1
500ms−1
250ms−1
600ms−1

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