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Which property of iron-containing cast implements enhanced gunpowder projectiles' kinetic energy?

A)Greater elastic strain energy storage
B)Higher inertia contributes momentum
C)Lower thermal expansion rate
D)Increased magnetic permeability assists guidance

💡 Explanation

For Chinese fire lances, higher inertia from heavier iron projectiles meant larger momentum transfers because momentum equals mass times velocity. Therefore more kinetic energy delivered is the answer, rather than just energy storage or thermal stability.

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