The COR represents the elasticity of an impact between two bodies,the impact being either perfectly elastic or inelastic,or somewhere in between.In terms of the numbers simply look at the equation ; its the ratio of the difference of the velocities before and after a collision or impact has...
These sketches appear to be from a text we used in aeronautical engineering at St.Louis University,for statics and dynamics,the Spanish language version.
I'm certain it was authored by Beers and Johnson,this text was used back in the late 60's & early 70's,very popular standard statics and...