(adsbygoogle = window.adsbygoogle || []).push({}); A weird collision "theorem"

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Many moons ago I thought I heard a professor refer to a "theorem" in mechanics which stated that if a hard object is released from an infinitesimal height above a hard surface, the force will be exactly twice the weight of the object.

Did I hear correctly? If so, any ideas on a derivation of this?

Thanks

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# A weird collision theorem

**Physics Forums | Science Articles, Homework Help, Discussion**