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ark to shoot at, as for practice, or to test the accuracy of a firearm, or the force of a projectile.

An apparatus for measuring speed, as of machinery or vessels, but especially of projectiles.

nitial velocity, the velocity of a moving body at starting; especially, the velocity of a projectile as it leaves the mouth of a firearm from which it is discharged. -- Relative velocity, the velocity with which a body approaches or recedes from another body, whether both are moving or only one. -- Uniform velocity,…

The sudden compression of the air caused by a projectile in passing close to another body.