Destroyable object with physics

I need some example with destroyable object.

Example: I have a box. When I shoot at him, he explodes. When he explodes, he spawn a parts of a box. This parts are with physics behaviour.

My game are platformer.

I'm no expert, but this is how I would do it:

masspanicmusic.com/construct/boxexplode.rar (CC r2 version)

It was just made very quickly and roughly to demonstrate, if anyone else has a better method I would be interested as well.

Thanks!