A stuntwoman (mass = $60\ \mathrm{kg}$) scales a 40‑meter‑tall rock face.
What is her gravitational potential energy (relative to the ground)?
$U_{\mathrm{g}}=24,000\ \mathrm{J}$
Calling the ground $h=0$, we find
$$U_{\mathrm{g}}=mgh$$
$$U_{\mathrm{g}}=(60\ \mathrm{kg})\left(10\ \mathrm{\displaystyle \frac{m}{\ s^2}}\right)(40\ \mathrm{m})$$
$$U_{\mathrm{g}}=24,000\ \mathrm{J}$$