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## Some notes made during making the collision demo

Written by Nasser M. Abbasi

June 28, 2015

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Given 2 particles with velocity components as shown.

In elastic collision linear momentum in the and directions holds

In addition, kinetic energy is constant. Let , ,
then

We have 3 equations above, but 4 unknowns . The 4th equation comes from knowing that after collision,
particles will travel at trajectories.