2D Conservation of Momentum Example using Air Hockey Discs (13:27)
A 28.8 g yellow air hockey disc elastically strikes a 26.9 g stationary red air hockey disc. If the velocity of the yellow disc before the collision is 33.6 cm/s in the x direction & after the collision it is 10.7 cm/s at an angle 63.4° S of E, what is the velocity of the red disc after the collision?
This is an AP Physics 1 topic. Honestly, while this is an AP Physics 1 topic, I have yet to see a conservation of momentum problem on the AP Physics 1 exam which is in more than one dimension. This is certainly covered on the AP Physics C: Mechanics Exam, however, I don't think it actually is on the AP Physics 1 Exam. Does anybody have information which contradicts this statement? Content Times: 0:12 The problem 1:49 Breaking the initial velocity of disc 1 into its components 3:06 Conservation of momentum in the xdirection 5:24 Conservation of momentum in the ydirection 6:26 Solving for the final velocity of disc 2 using its components 8:40 Was this an elastic collision? 12:39 Movie Character Day! 

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Multilingual? Please help translate Flipping Physics videos!
If you were curious where the known values came from in the video: Here are my calculations.
Picture Credits: "Nombre de los vientos". Licensed under Public domain via Wikimedia Commons