the sum of the potential and kinetic energy the difference of the potential and kinetic energy only the kinetic energy only the potential energy
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: What does the mechanical energy of a system include?
Possibilities:
- the sum of the potential and kinetic energy
- the difference of the potential and kinetic energy
- only the kinetic energy
- only the potential energy

the sum of the potential and kinetic energy