# If a strong man lifts a barbell with a mass of 125.7 g and does 5023 joules of work, how high did he lift it?

Sep 29, 2014

The equation for gravitational potential energy is:

$\Delta {E}_{g} = m g \Delta H$

Therefore,

$\Delta H = \frac{\Delta {E}_{g}}{m g}$

$\Delta {E}_{g} = 5023 J$
$m = 125.7 g = 0.1257 k g$
$g = 10$

$\Delta H = \frac{5023}{0.1257 \times 10} = 4000 m$