Verified answer

Answer:

73.575 Joules

Explanation:

The formula in getting the gravitational potential energy of an object is taken to be:  

U = mgh  

Where  

U = gravitational potential energy, Joules  

m = mass, kg  

g = acceleration of earth due to gravity,  

h = height from a reference point, m  

Given:  

m = 3 kg  

h = 2.5 m  

g = 9.81 (constant)

We can get the gravitational potential energy by using the formula shown.

By substituting the given values, we now have:

U = (3 kg)(9.81 )(2.5 m)

U = 73.575 Joules.

Therefore, the gravitational potential energy of a 3 kg box that is placed on a shelf that is 2.5 m high is equal to 73.575 Joules.