It turns out to be even easier. Just throw a baseball straight up into the air. Earth will move slowly in the opposite direction. Don't believe me, try it yourself. That is, there is no elasticity no bounce to it.
Inelastic collisions are common whenever sticky things or pointy things collide.
Two blobs of clay collide and stick together. It is interesting to note that even if the counter has some friction the answer will be the same. The duration of impact is so small friction does not have time to alter the final speed until later. A 4.2 pound can of beans sits on a 7.0 ft fence post. As the trig-weary student might fear, momentum is a vector quantity.