Hi everyone, I'm having some difficulty comprehending "normal" transmission of stress/strain through a solid body and "shock" transmission of stress/strain. Imagine I have two bodies, one rigid - the other elastic. If the rigid body is fixed in space, and the elastic body is flying at the rigid body with velocity V At what speed does the pressure wave transmit backward through the elastic body upon impact with the rigid plate? Does this happen at the speed of sound in the medium (i.e. C = sqrt(K/row)). What if V >> C? or V == C? Finally, from what I have read, the "shock wave" comes from the increase in speed of sound through the medium with increasing pressure (density?) - and so if the elastic body exhibits plasticity & is crushed as it impacts the rigid plate - do the "normal waves" at initial impact get caught up with by "normal waves" of the compressed region a few milliseconds later, to form a shock? I could be completely off base, i'm just trying to visualize the transmission of pressure/stress/strain through the solid body under impact. Any help would be greatly appreciated!