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## Homework Statement

http://img15.imageshack.us/img15/407/draw.th.png [Broken]

Initially m and m' are at rest and at the same height. The planes are perpendicular. Find the minimal distance that separates m and m'.

## Homework Equations

## The Attempt at a Solution

Well the distance that separates them is the length of the vector that describes m 's position relative to m'. But then I fail to find any idea on how to get to that vector.

Thanks for your help.

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