Is it possible, negative temperature in kelvin scale?

Well it could be defined and discussed as a curiosity, just like a speed greater than c could be. But it could never actually exist, because zero-K is absolute zero, or the total lack of any thermal energy. Negative-K would be like going into a dark room and creating a negative light intensity.

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.