Mechanical energy is the sum of what type of energy and potential energy?

Answer 1

It is energy held in reserve, not being used but available depending on some other action. It could be gravitational, due to a weight being raised to a high position, or it could be stored in elastic, in a model airplane for example. It could be energy stored in a gas at high pressure, which could do work if released.

You could say that fuels such as fossil fuels or even uranium have potential energy, because it just requires some circumstance such as ignition or a nuclear chain reaction to release the energy, which would otherwise stay locked up in the fuel

Answer 2

At any instant of time, the total mechanical energy is the sum of the potential energy

and kinetic energy at that time.

Over a period of time, if nothing came along and stole any of it ... such as friction

or somebody bumping into the system ... then the total initial mechanical energy

and the total final mechanical energy are equal.

Answer 3

solar energy.

Answer 4

kinetic