Answer :
As the bob swings back towards its equilibrium position, its potential energy is converted into kinetic energy, causing it to accelerate. When the bob reaches its equilibrium position, it momentarily comes to a stop before accelerating in the opposite direction.
At this point, all of the potential energy has been converted into kinetic energy, and the velocity of the bob is at its maximum. The exact velocity of the bob at the equilibrium position can be calculated using conservation of energy principles, taking into account the mass of the bob, the length of the string, and the maximum angle of displacement. Additionally, the period and frequency of the bob's motion can also be determined using equations of simple harmonic motion.
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