1. The problem statement, all variables and given/known data Which of the following statements is/are true? Choose all that apply. a. The total mechanical energy of a system, at any one instant, is either all kinetic or all potential energy. b. The total mechanical energy of a system is equally divided between kinetic and potential energy. c. The total mechanical energy of a system is constant only if conservative forces act. d. The total mechanical energy of a system is constant only if nonconservative forces act. e. Mechanical energy can be dissipated to nonmechanical forms of energy. 2. Relevant equations N/A 3. The attempt at a solution I believe the answers are both c and e. I just wanted to clear up letter c because conservative forces are the ones that make total mechanical energy of a system constant, correct? Not nonconservative forces, because they would dissipate over time. Is this correct?