# Double Ball Drop

1. May 30, 2009

### Gibanga

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?)

Last edited: May 30, 2009
2. May 30, 2009

### cesiumfrog

Assume reflection with the ground has just reversed the velocity of the bottom ball.