If an object is moving under constant acceleration then it is possible to reverse its direction once
Like when we throw an object upwards under the action of constant gravity then the object first moves upwards then stops after reaching maximum height and reverse its direction to move back.
now for the next case it is not possible to reverse the direction twice when an object moves under constant acceleration
so when once object reverse it direction then after that it comes in the direction of acceleration and then continue in the same direction for whole motion
