Deriving the Inelastic 3-Body Equation for Colliding Balls with Different Masses

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What equation should I use to represent a 3 body inelastic equation .. two ball of different masses falling together and colliding with the stationary ground.

And any hints on deriving the two body equation shown below
 

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momentum before equals momentum after.

or you could calculate the centre of mass. but that would only work for a two body collision (i think).
 
Im writing a research essay on balls of different mass falling from a fixed height onto the floor. Divided into two parts, I first vary the mass of the top ball and then for the next part I vary the mass of the bigger base ball. No I am using the general inelastic equation.. attached above and I need to go about first deriving it and then incoporating a collision with the floor. So a 3 body collision?