The acceleration of a pendulum is zero at the lowest point of its swing.
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No Time period, T = 2π √(l/g) π - pi l - lenght of the pendulum g - acceleration due to gravity at the place
The length of the pendulum is measured from the pendulum's point of suspension to the center of mass of its bob. Its amplitude is the string's angular displacement from its vertical or its equilibrium position.
When the pendulum is at its lowest point, it has the least potential energy. Therefore, logically, due to conservation of energy, its kinetic energy is at its maximum. Therefore its speed is also at its maximum, as well as its momentum (velocity x mass).
The amplitude of a pendulum is the distance between its equilibrium point and the farthest point that it reaches during each oscillation.
The equilibrium point of a pendulum is when it does not oscillate and is quite stable. It does not count if you interfere with the movement of the pendulum (eg.: by holding it).