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Pb

Suppose I drop a piece of lead. The Earth, via gravity, does positive work
on the lead and increases its KE. OK? The lead hits the floor; the flood
does negative work on the lead; the lead halts. KE->0 OK? Does Wgravity =
Wfloor?

Why is the lead heated?

Please state any assumptions in you reply.



Jim Green
mailto:JMGreen@sisna.com
http://users.sisna.com/jmgreen