Answer:
GE = ME -
, which agrees with option C in your list.
Step-by-step explanation:
The definition of Mechanical Energy (ME) of a system is the addition of the gravitational potential energy (GE) plus the kinetic energy (KE) of the system:
ME = GE + KE
Given that the KE is:
,
solving for GE in the formula above gives:
GE = ME - KE = ME -
, which agrees with option C