multiple impact generates the neeeded \(KE\) input to the system that averages (root-mean-squared) to \(v_{boom}\).
In cases where \(v_{boom}\) is generated directly, for example a concussion charge down a sealed tube full of water or ice, the exact speed of the explosive wave front equals to \(v_{boom}\) of the material used. This would be an invention that makes mining, excavations, demolitions and other construction explosions cheap.
Happy New Year 2017
