Answer
(a) an object is falling in free fall straight down toward the ground
(b) a projectile is moving upward in the air directly away from the ground
(c) an object is moving in a circle in uniform circular motion
Work Step by Step
(a) When an object is falling in free fall straight down toward the ground, the velocity vector is directed straight down and the acceleration vector is directed straight down.
(b) When a projectile is moving upward in the air directly away from the ground, the velocity vector is directed straight up and the acceleration vector is directed straight down.
(c) When an object is moving in a circle in uniform circular motion (i.e. at constant speed), then the velocity vector is directed tangential to the circle and the acceleration vector is directed toward the center of the circle.
