Kinetic energy only exist if object has motion.
At point 3 , kinetic energy is highest.
We know that,
Kinetic energy = [tex]\frac{1}{2} mv^{2}[/tex]
Where m is mass of pendulum and v is speed of pendulum.
Since the mass of the pendulum would not change, the only way for kinetic energy to change is for the speed of the pendulum to change.
Kinetic energy is highest when the velocity is the highest. This occurs at the bottom of the pendulum.
At the lowest point (Point 3 ) the pendulum has its greatest speed. All of the energy in the pendulum is kinetic energy and there is no gravitational potential energy.
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