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How does a graph of an inelastic collision look like? I've searched through the web and found 2 possible answers, but obviously there's only one answer.

www.vernier.com/innovate/impulse-comparison-for-elastic-and-inelastic-collisions

The inelastic collision (the graph on the bottom) displayed some interesting results. The difficulty in performing this experiment is using materials that produce an inelastic collision. We felt that clay was a good choice, however, the bottom graph shows us that the cart is bouncing back very slightly.

en.wikipedia.org/wiki/Inelastic_collision

An inelastic collision, in contrast to an elastic collision, is a collision in which kinetic energy is not conserved due to the action of internal friction. In collisions of macroscopic bodies, some kinetic energy is turned into vibrational energy of the atoms, causing a heating effect, and the bodies are deformed.

A 750g cart crashes and sticks to a twin cart and they move off together. Then thy hit the wall and bounce back. Yay graphed data.

spiff.rit.edu/classes/phys311.old/lectures/elas/elas.html

Collisions: Elastic and Inelastic Although the momentum of individual objects may change during a collision, the total momentum of all the objects in an isolated system remains constant. An isolated system is one on which the net force from external sources is zero. For example, a hockey puck sliding along the ice is an isolated system: there ...

physics4abalewis.blogspot.com/2012/12/inelastic-collisions-lab.html

The graph shows the position vs. time graph of the cart moving by itself, colliding with the other cart, and then showing both carts moving together as time goes on. This graph shows that the cart prior to collision will have a higher velocity than the two carts together.

www.physics.ryerson.ca/sites/default/files/PCS211_ConsOfMomentum_0.pdf

4.)Perfectly Inelastic Collision (a)A perfectly inelastic collision is one where the two objects stick together after the collision. Draw two diagrams of the situation, one before the collision and one after the collision. Your diagram should show both cars. Let’s call the car which is initially moving \1", while the car initially at rest is \2".