When a pendulum is at the position all the way to the left when it is swinging (at the top of the arc), what is true of the kinetic and potential energy? a) the potential energy is zero, and the kinetic energy is maximized. b) the kinetic energy is zero, and the potential energy is maximized. c) both the kinetic and potential energy are zero. d) both the kinetic and potential energy are at their maximum. d) there is no energy at this position.