GEO 2024Q70
Q: 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 the remaining kinetic energy is spent in 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?
(a)300 √10 m s⁻¹
(b)3600 m s⁻¹
(c)300 √5 m s⁻¹
(d)900 m s⁻¹
Answer pending verification