> I have a sphere, falling from 20 feet, and assuming a vacuum. 
> What deceleration do I need to I need to design to?

[EE] tag added...

Just falling won't cause any deceleration :)

Assuming that your ball will hit some floor: you need more information,
how will the ball (and the floor) behave? But I think it won't be easy
to deduce the G's from the material properties, an experiment on
high-speed film would be easier.

Wouter van Ooijen

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