Answer:

Step-by-step explanation:
Given
--- Potential Energy

Required
Determine the height of the hill
The potential energy is equal to

So, we have:

By substitution,

Work Done is calculated as follows:

In this case:
The force is represented by the weight of the snowball and the distance is the required height.
So, the equation becomes

Substitute values for Work Done and Height

Make Height the subject


(approximated)