How do i push surrounding objects away along X axis?

Hi guys

I have 3 boxes in a row. What i want is if i destroy the box in the middle, the other 2 boxes will be pushed away (X axis).

What should i use?

Thanks!

you might find this piece of the documentation of the usefull:

http://unity3d.com/support/documentation/ScriptReference/Rigidbody.AddExplosionForce.html