As the one pendulum has slightly larger amplitude,then it has slightly higher speed with respect to the mean position.so it moves faster at the lowest point in its swing than the other one.
The period of a pendulum is occasionally thought to be dependent on the mass or the displacement. Although the distance to travel rises as the amplitude increases, the restoring force also grows, correspondingly increasing the acceleration. A pendulum's maximum height is known as its amplitude. Although you may assume that this would have a huge impact on the pendulum's period, it really has very little of an impact. Especially when producing modest swings, the amplitude often has no impact at all on the pendulum's period. The oscillation frequency of pendulums is independent of both mass and amplitude. It only depends on the length of the pendulum and the acceleration caused by gravity. The amount by which the oscillating variable changes with each oscillation in an oscillating system is known as amplitude.
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