Which apple has the greatest potential energy?

Answer: Apple at point D
Explanation:
Potential energy is the energy possessed by an object by virtue of its position.
[tex]P.E=m\times g\times h[/tex]
m= mass of object
g = acceleration due to gravity = [tex]10ms^{-2}[/tex]
h = height of an object
Thus as can be seen from the relation, potential energy is directly proportional to the height of an object, the apple with maximum height, at point D will have maximum potential energy.