Hypervelocity is usually refered to a very high velocity, such as over 10,000 feet per second. In particular, it refers to velocities sufficiently high that the strength of materials is very small compared to inertial stresses. Thus, even metals behave like fluids under hypervelocity impact. Extreme hypervelocity results in vaporization of the impactor and target. For structural metals, hypervelocity is generally considered to be over 2500 m/s. Meteor craters are also examples of hypervelocity impact. This article is about velocity in physics. ... This article is about a foot as a unit of length. ... The second (symbol: s) is the SI base unit of time. ...

Hypervelocity tends to refer to velocities in the range of a few kilometres per second to some tens of kilometres per second. It is especially relevant to the field of space exploration, where hypervelocity impacts can result in anything from minor component degradation to the complete destruction of a spacecraft. The impactor, as well as the surface it hits, can undergo temporary liquefaction. The impact process can generate plasma discharges, which can interfere with spacecraft electronics. This article is about velocity in physics. ... A kilometre (American spelling: kilometer) (symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). ... The second (symbol: s) is the SI base unit of time. ... A kilometre (American spelling: kilometer) (symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). ... The second (symbol: s) is the SI base unit of time. ...