At which position is the kinetic energy of the pendulum bob at its maximum?

The kinetic energy of a pendulum bob reaches its maximum at the lowest point of its swing, which is when it is directly vertical (position C). This is due to the transformation of energy that occurs during the pendulum's motion. At the highest points of the swing (positions A and B), the pendulum has maximum potential energy and minimal kinetic energy, as it momentarily comes to rest before reversing direction. As the bob swings downwards, gravitational potential energy is converted into kinetic energy, causing the speed of the bob to increase.

At position C, the pendulum has converted all its potential energy into kinetic energy, resulting in the highest speed and thus maximum kinetic energy. Beyond this point, as the pendulum moves back upward, kinetic energy decreases and potential energy increases again. Therefore, position C is significant as it defines the transition point where kinetic energy is maximized, corresponding to the dynamics of energy transformation in the pendulum's motion.