Double Ball Drop and linear momentum

AI Thread Summary
To determine the velocities of two balls of different masses after they collide with the ground, consider the conservation of momentum and the effects of the collision. The bottom ball, upon hitting the ground, reverses its velocity while the top ball continues to fall. After the collision, the bottom ball's upward velocity will equal the downward velocity of the top ball just before impact. The final velocities can be calculated using the principles of momentum conservation and the known masses of the balls. Understanding these concepts will clarify the problem and help solve it effectively.
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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.
 

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