# What is the potential energy of a 2.5 kg book held 2.0 m above the ground?

Nov 25, 2015

$49 J$ of energy

#### Explanation:

Formula for potential energy:
$P . E = m g h$
$m =$ mass($k g$)
$g =$ gravity($m$/${s}^{2}$)
$h =$ height/distance($m$)

What is given to you? Well the book is held from the ground of a distance $2.0 m$, so $h = 2.0 m$. Next we know that the book weighs $2.5 k g$, so $m = 2.5 k g$.

Now we just put it in the formula:
PE=(2.5kg)xx(9.8m/s^2)xx(2.0m)
$P E = 49 J$