What happens during constructive interference? two waves moving through the same medium add their effects one wave prevents another from moving through the same medium two waves produce two more waves waves moving in opposite directions cancel each other out

two waves moving through the same medium add their effects

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.

it has to be b, about 97 percent.