Aman is walking while riding a train. he says he is moving at 2 mph. a woman standing on a platform at a train station says the man on the train is moving at 72 mph. which person is correct?

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.