Hi :) how to do this?

Work done, W = 13.72 J                                                    

Explanation:

Given that,

Mass of the coin, m = 4 g

It is dropped from the observation deck of a skyscraper 350 meters above the street below.

We need to find the  work done by gravity on the coin as it falls. The work done by the gravity is simply given by :

So, the work done by gravity on the coin as it falls is 13.72 Joules.