# What is the gravitational potential energy of a  2 kg object on a shelf  1/4 m  high?

Jul 3, 2018

$4.9$ joules

#### Explanation:

Gravitational potential energy is given by the equation:

$E = m g h$

where:

• $E$ is the gravitational potential energy in joules

• $m$ is the mass of the object in kilograms

• $g$ is the gravitational acceleration, which is around $9.8 \setminus {\text{m/s}}^{2}$ on Earth

• $h$ is the height of the object in meters

So, we get:

$E = 2 \setminus \text{kg"*9.8 \ "m/s"^2*1/4 \ "m}$

$= 4.9 \setminus {\text{kg m"^2"/s}}^{2}$

=4.9 \ "J" \ (because 1 \ "J"-=1 \ "kg m"^2"/s"^2)