# What is the gravitational potential energy of a # 2 kg# object on a shelf # 3/2 m # high?

##### 1 Answer

Gravitational potential energy is given by

#### Explanation:

Gravitational potential energy is energy an object has because of its position in a gravitational field. It is always measured *relative* to another point in the field: in this case, the height of the shelf compared with the gravitational energy of the same object if it was on the floor. We have defined the floor as 'zero' height for the purposes of this question.

The gravitational potential energy depends on the strength of the local gravitational field, the mass of the object and its height above (or below - in which case the gravitational potential would be negative) our zero level. The formula is:

(some books use

Where:

For this particular case,

A note here: