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Meaning of ballistic pendulum

ballis'tic pen'dulum

Pronunciation: [key]
— Physics. Physics.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.