At which two points on the pendulum, is the pendulum experiencing the greatest potential energy? question 21 options: a and d a and c b and c a and b

at its highest point (point a) the pendulum is momentarily motionless.  all of the energy in the pendulum is gravitational potential energy and there is no kinetic energy.  at the lowest point (point d) the pendulum has its greatest speed.  all of the energy in the pendulum is kinetic energy and there is no gravitational potential energy.  however, the total energy is constant as a function of time.

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