Question

multiple choice question
which is needed to calculate gravitational potential energy?
o neither height nor a reference level
o only a reference level
o height and a reference level
o only height
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Explanation:

Gravitational potential energy \( U = mgh \), where \( h \) is the height relative to a reference level. So both height (relative to a point) and a reference level (the point from which height is measured) are needed.

Answer:

height and a reference level