A simple pendulum.
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A pendulum.
The acceleration of a pendulum is zero at the lowest point of its swing.
Apogee
I think it will as it has mechanical parts to make the pendulum move, not 100% sure.
The period of a pendulum is affected by the angle created by the swing of the pendulum, the length of the attachment to the mass, and the weight of the mass on the end of the pendulum.