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Energy can not be created or destroyed but can change from one form to another.
example: as a roller coaster cart loses height the more speed it gains, the potential energy is transferred into kenetic energy
PE=mgh
180=0.5*10*h
180=5h
h=180/5=36 m
Answer:
The third choice: 
Explanation:
The cork is positively charged, therefore we know tat there must be excess of positively charged protons present.
The charge
of a proton is
;
therefore, the number
that makes up a charge of
is


which is the 3rd choice.