Double Ball Drop and linear momentum

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Gibanga
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I'm having a problem with this problem:

Two balls of different mass are dropped one in top of the other, more precisely the one with the smaller mass on top.

How can i figure out the velocity of both balls after the collision with the ground?

I know this is a very trivial linear momentum problem, but i just can't get my head around it.

Can someone enlighten me?

(sorry for posting this tipe of question here, I'm new to the forum and i just realized that i should post this in the homework tab, btw, how can i delete posts or move them to another place?)
 
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Assume reflection with the ground has just reversed the velocity of the bottom ball.