Question

Define the law of conservation of energy

Answer 1

The Law of Conservation of Energy is a law that states that all energy, kinetic and potential, are conserved and transformed in a closed system.

This means that the initial energy is equal to the final energy.
$E_{i} =E_{f}$

Answer 2

In physics, the law of conservation of energy states that the totalenergy of an isolated system remains constant—it is said to be conserved over time. Energy can neither be created nor destroyed; rather, it transforms from one form to another.