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**Question about momentum depending if the collision is elastic or not??**

## Homework Statement

Im writing up a lab, and there is something I can seem to get. Does the change in momentum depend on whether the collision is elastic or not? I know it does, but HOW?

For example collision of 2 carts, 1) collision with velcro on each cart, 2) attracting magnets on each cart 3) repeling magnets on each cart)

Is it reasonable to take as an approximation that the linear momentum of a system of collising macroscopic objects is conserved???

Thanks for any help!