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ballistic pendulum

noun, Physics.
a device consisting of a large mass hung from a horizontal bar by two rods, used to measure the velocity of an object, as a bullet, by retaining the object upon impact, its velocity being a function of the displacement of the mass.
Origin of ballistic pendulum
1770-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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