>>13487306in the moment the weight becomes stationary, all kinetic energy from it went to elastic energy which deforms the surface. if the surface cannot widthstand this it breaks and if it does it CAN transfer its elastic energy back to kinetic energy of the object.
but the failure of the surface is pretty complex probably and also depends on how the concentrated the forces are. the bouncy object spreads the load over a wider surface which also plays a role
