A pendulum swings through a total of 28°. If the displacement is equal on each side of the equilibrium position, what is the amplitude of this vibration? (Disregard frictional forces acting on the pendulum.)

14°

Explanation:

From the question; we are being told that the pendulum swings through a total displacement of 28°,we are to assume  that  the displacement is equal on each side of the equilibrium position.

So; the amplitude of the vibration literally reflects the maximum displacement generated by a moving body, its wave is usually measured from the equilibrium position which equal to one-half of the length of the vibrating path. Having said that; the amplitude of this vibration is one-half displacement of the pendulum

i.e

A = of 28°

A = 14°