Conservation of momentum
https://serc.carleton.edu/details/files/37946.html
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Category: Conservation of momentum
Drop brick on moving cart, dot diagram, graphs
http://www.physicsclassroom.com/Physics-Interactives/Momentum-and-Collisions/The-Cart-and-the-Brick
N.B. Preview is created automatically, doesn't always work and may capture splash screens.