Answer: Mechanical energy
Step-by-step explanation:
Mechanical energy of a body can be defined as the sum of potential energy and kinetic energy of a system.
The conservation of mechanical energy states that the sum of kinetic energy and potential energy in a system remains constant.
The only condition is the forces acting on it should be conservative forces.
Example: Running of a dog. It is its mechanical energy that is allowing a dog to run by the combination of kinetic and potential energy.