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In the "short view" it seems the KE of the Pb changed from zero to something
(by gravity) then from something to zero (by the floor). These would seem
equal and opposite making work-floor equal minus work-gravity.
In the "long view," if we try to perform bookkeeping on the energy including
thermal energy, wouldn't we have to say some of the KE of the falling Pb
eventually ended up as thermal energy in the floor in addition to thermal
energy in the Pb?
the "missing energy" is in the floor as a
result of the work the Pb did on the floor?