The gravitational potential energy of an object is often approximated as mgh, for which \(m\) is its mass, \(h\) is the height above the Earth's surface, and g is the acceleration due to gravity. What assumption is required in order to approximate \(g\) as a constant?

W) Wind resistance is negligible

X) The object has no rotational inertia

Y) \(m\) is very small compared to the mass of the Earth

Z) \(h\) is very small compared to the radius of the Earth
Z) \(h\) is very small compared to the radius of the Earth