A body thrown from the surface of the earth at an angle alpha to the horizon fell to the ground.

A body thrown from the surface of the earth at an angle alpha to the horizon fell to the ground. What is the work of gravity? How has the potential energy of this body changed?

A = m * g * (h1-h2) = 0
since h1 = h2
We all know instinctively that a heavy weight lifted over someone’s head is a potentially dangerous situation. The weight can be securely anchored, so it is not necessarily dangerous. We are concerned that anything that provides the force to protect the weight from gravity may fail. To use the correct physical terminology, we are interested in the gravitational potential energy of weight.
All conservative forces have potential energy associated with them. The force of gravity is no exception. The potential gravitational energy is usually given the symbol U, the start index, g, the end index, It represents the potential an object must do work as a result of being in a certain position in the gravitational field.