The phrase "impact velocity" refers to the speed at which something hits another object or surface. It describes how fast an object travels right before coming into contact with something else. Full definition
The calibration test proved the test setup and gave the team confidence they could provide the needed impact velocity, he said. (sciencedaily.com)
But limited supply of deals may impact that velocity in 2014. (nreionline.com)
The slow impact velocity of previous models requires it to have originated from an orbit very near Earth, while the new model allows for an origin from more far - flung parts of the solar system, researchers report in an upcoming issue of Icarus. (sciencemag.org)