How does a pendulum model an energy conversation system?

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

answer; how far out of place which the object finished relative to the starting location;

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach