## College Physics (7th Edition)

The potential energy is proportional to $(h-h_{0})$ So, if we want to give positive value to the expression, then we should set the reference height lower than the position of the object, so that $h>h_{0}$.
The potential energy is proportional to $(h-h_{0})$ So, if we want to give positive value to the expression, then we should set the reference height lower than the position of the object, so that $h>h_{0}$.