Complete the following sentences. a. The motion of the particles is a model of. . b. The movement of particles from one chamber to another is a model of. . c. When the average motion of the particles is the same in both chambers, this is a model of .

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.