Heat transfer between two substances that are in contact is called

c, 1a hope this

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.

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray

the right answer is 0.3 meters per second