It has been said that sometimes lead bullets melt upon impact. Assume that a bullet receives 75% of the work done on it by a wall on impact as an increase in internal energy.
a) What is the minimum speed with which a 15-g lead bullet would have to hit a surface (assuming the bullet stops completely and all the kinetic energy is absorbed by it) in order to begin melting?
b) What is the minimum impact speed required for the bullet to melt completely?
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