Which statement can best describe the energy transformations that occur when a pendulum swings back and forth? a. gravitational energy is converted to spring energy and back.
b. gravitational energy is converted to kinetic energy and back
c. kinetic energy is converted to spring energy and back
d. none of the above.​

I think it is C, I'm not for sure.

b. gravitational energy is converted to kinetic energy and back

Explanation:

All gravity potential at the high ends of its swing

All kinetic energy at the midpoint of the swing.

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

none, its a machine