It takes a person one half hour to run 6 kilometers at a constant rate along a straight-line path. what is the velocity of the person?

the body's situation won't change the forces are equal opposit and on the same body

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.