A 0620 kg snowball is fired from a cliff 137 m high the

Question

Problem: A 0.620 kg snowball is fired from a cliff 13.7 m high. The snowball's initial velocity is 19.3 m/s, directed 33.0° above the horizontal.

Part A: What is the change in the gravitational potential energy of the snowball-Earth system during the flight?

I need help to find the change in the gravitational potential energy of the snowball-Earth system during the flight.