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  4. At 30° C, a lead bullet of 50 g, is fired vertically upwards with a speed of 840 m / s. The specific heat of lead is 0.02 cal / g ° C. On returning to the starting level, it strikes a cake of ice at 0° C. The amount of ice melted is (Assume all the energy is spent in melting only latent heat of fusion of ice is 80 cal / g )

Q. At , a lead bullet of , is fired vertically upwards with a speed of . The specific heat of lead is . On returning to the starting level, it strikes a cake of ice at . The amount of ice melted is (Assume all the energy is spent in melting only \& latent heat of fusion of ice is )

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