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PEgrv==work done against a weight (or -work by wieght)
PEspr==work done against a spring (or -work by spring)
PEelctr==(later) is work against the electric field.
In general work done against a conservative force
BECOMES POTENTIAL ENERGY ASSOCIATED WITH THAT FORCE
(energy=ability to do work). Is this acceptable or not?
Ludwik Kowalski