A ball thrown upwards reaches a maximum height and then comes back down to the original level.
-As the ball is going upwards
A)the velocity and acceleration both point up.
B)the velocity points up and the acceleration down.
C)the velocity points down and the acceleration up.
D)the velocity and acceleration both point down.
E)the acceleration is zero.

Question

A ball thrown upwards reaches a maximum height and then comes back down to the original level. 
-As the ball is going upwards
A)the velocity and acceleration both point up.
B)the velocity points up and the acceleration down.
C)the velocity points down and the acceleration up.
D)the velocity and acceleration both point down.
E)the acceleration is zero.

Quizplus · Accepted Answer

As the ball is going upwards, gravity is acting downwards which causes a downward acceleration. However, the initial upward velocity of the ball causes it to continue moving upwards for a period of time. As the ball moves upwards, its velocity decreases until it reaches a maximum height where the velocity becomes zero. At this point, the acceleration is solely due to gravity and is directed downwards. As the ball begins to move back downwards, both the velocity and acceleration are directed downwards. Therefore, the correct choice is B - the velocity points up and the acceleration down.

A Ball Thrown Upwards Reaches a Maximum Height and Then