Question

If any object enters the gravitational field the potential energy of the object in order is transformed into kinetic energy therefore it reaches the ground.what form of energy is converted into potential energy?

Answer 1

Work done accomplishes the fact of the object gaining potential energy.

Explanation:

Imagine a coal burning power plant. The chemical energy in coal is released in burning to boil water whose steam turns a shaft that drives a generator to generate electrical energy. Then you use the motor in an elevator to lift a large mass to a high floor. The motor consumed electrical energy to do work to lift the large mass.

The large mass now has potential energy because the motor did work.

I hope this helps,
Steve