yup.. the moving object comes to a stop.. Head on collision, 1D.
Another qn regarding collisions, if the moving object and rod move together to the deflected position ( ie. also stopping distance for the object ), do I consider it as an inelastic collision (objects stick together after collision) then?
Guess the objective is to keep the deflection as little as possible, without using an unnecessarily large rod diameter.. As for quantity, probably less than 1mm? Gotta ask my supervisor what he advises.. =)