55. After a displacement of - 26 m, a train on a straight track is at the position xr = 4.3 m. What was the train's
initial position?

it breaks and dirupture other materials and other sencews from the bottom

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.