As a pendulum moves toward the equilibrium position, velocity and acceleration . As the pendulum moves away from the equilibrium position, velocity and acceleration . Velocity is at a when acceleration is zero.

As the pendulum moves toward equilibrium, its acceleration points toward equilibrium, in the same direction as its velocity, so it speeds up. Moving away from equilibrium, acceleration points back toward equilibrium, opposite its velocity, so it slows down. At equilibrium, acceleration is zero and the pendulum’s velocity is at a maximum, so the correct choice is maximum.

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