"what if we just dropped rocks on our enemies"

"yes, but how do we turn that in to a billion dollar defense contract?"

https://en.wikipedia.org/wiki/Lazy_Dog_(bomb)

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actually a falling human body only reaches about 120 mph before it can't go any faster due to air resistance - this is called terminal velocity.

you actually need engineering to make something that weighs 20 grams go fast enough to be lethal when dropped from a plane.