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Homework Statement
Part 1:
We have all seen news footage from the Middle East in particular, where heavily armed gunmen toting AK-47 assault rifles fire their weapons into the air. What happens to the bullet after the trigger is squeezed? Can it be dangerous for people nearby when the bullet comes back down?
Part 2:
Assume the bullet is gyroscopically stable. Would wearing a modern army Kevlar helmet protect you?
I have found out that the muzzle velocity on an AK-47 is around 710m/s and a Modern Kevlar Helmet can handle up to 610m/s.