The units for potential energy PE are?

The us government wants to allocate billions of dollars in the next 10 years to assure our future energy security. the funds will be spread among a variety of possible energy resources. where do you think the government should put the greatest support: solar energy, wind energy, clean coal, oil exploration, gas exploration, or a combination of sources? are there other efforts that should be explored? support your position with cited information for both questions.

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

Atomic nuclei of almost all elements consist of