Assume that the pendulum clock shown is a closed system. Which statement describes evidence that the pendulum energy is conserved even as it eventually stops moving? A. Energy must be added to the pendulum to keep it from slowing down. B. Some of the clocks matter is transformed into new energy. C. all it’s mechanical energy is transformed into other forms of energy.

The correct option is;

C. All its mechanical energy is transformed into other forms of energy

Explanation:

The given parameters are;

The nature of the  system of the pendulum clock = Closed system

Present condition of the pendulum = Motionless

Initial condition = Moving

The principle of conservation of energy states that the sum of energy present in a closed system is always constant, as such, energy can neither be destroyed or created

Therefore, all the initial energy of motion of the pendulum which is known as mechanical energy, consisting of both potential and kinetic energy which resulted in the clock operation when the pendulum was in motion, has been transformed into other forms of energy which is shown by the at rest position having no motion, hence to kinetic energy, and no relative height to its location at rest, therefore, no relative potential energy.

Therefore, because the initial mechanical energy is now 0, going by the principle of energy conservation, all the mechanical has been transformed into other forms energy.