Three meter airtrack with gliders that rebound elastically, or stick.

AirTrack: Collisions in One Dimension. Elastic Collision: 2 air track gliders fitted with clockspring bumpers rebound when they collide. Inelastic Collision: 2 air track gliders fitted with velcro or magnets stick together when they collide.
UCB Index: 
A+35+20
PIRA Index: 
1N30.30
Demo Diagram: 

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