Answer:
Work is the energy transferred to or from an object via the application of force along a displacement.
Gravitational potential energy i think
I thinks its He uses proof to show the evidence is relevant. But im not totally positive on it hope this helps
<h2>Answer: electrostatic and gravitational force
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Mechanical energy remains constant (conserved) if only <u>conservative forces</u> act on the particles.
In this sense, the following forces are conservative:
-Gravitational
-Elastic
-Electrostatics
While the Friction Force and the Magnetic Force are not conservative.
According to this, mechanical energy is conserved in the presence of electrostatic and gravitational forces.
