What is energy? list the three mechanical forms of energy and their associated equations.

See the explanation below.

Explanation:

Energy is the ability of bodies to perform work and produce changes in themselves or other bodies.

There are several types of energy, but let's talk specifically about mechanical energy.

Mechanical energy is associated or subdivided into kinetic, potential, and elastic energies.

Kinetic energy

Potential energy

Elastic Energy

probably not if net force is zero