Question

According to the law of conservation of mechanical energy, if the only force acting on this pendulum is gravity, the total energy of the system is _____.

Answer 1

the same at A, B, and C

Answer 2

The conservation of mechanical energy is a principle which states that under certain conditions, the total mechanical energy of a system is constant.  It means that the total mechanical energy doesn't increase or decrease over time.  .Although this does not hold true when mechanical energy is converted to other forms, such as chemical, nuclear, or electromagnetic..