The figure represents the parabolic trajectory of a ball going from A to E in Earth gravity but without air resistance. What is the direction of the acceleration at point C?
A) It is to the right.
B) It is to the left.
C) It is straight up.
D) It is straight down.
E) The acceleration of the ball is zero.

Question

The figure represents the parabolic trajectory of a ball going from A to E in Earth gravity but without air resistance.  What is the direction of the acceleration at point C?
A) It is to the right. 
B) It is to the left. 
C) It is straight up. 
D) It is straight down. 
E) The acceleration of the ball is zero.

Quizplus · Accepted Answer

At point C, the ball reaches its maximum height and starts to fall back down, so the direction of acceleration must be straight down, opposing the velocity of the ball.

The Figure Represents the Parabolic Trajectory of a Ball Going