Verified Answer :

By putting an apple up on high ground. (That is 1 example)
This creates a higher gravitational force, and when it falls down it would have a lot of kinetic energy. But, if put on low ground, it wouldn't have enough potential energy to increase the kinetic energy.

AL2006


You can increase the gravitational potential energy of an apple
by gluing it back onto the tree-branch that it fell from.

Actually, by just lifting it to any place higher than where you find it.

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